There isn't too much about Skyrim as a whole that hasn't already been said, so I'm going to be very short about my general thoughts.
This was the second serious game I've ever played. Before this point, I had always exclusively played platformers on the DS and its ancestors. Some would argue that those were serious games, but I don't feel that way. Mostly because it ended there. I got Yoshi's Island, and I played it over and over again when I was bored. I wasn't interested in any other games.
Before Skyrim, I thought $60 on a game was insane. I was like: "Nope, not happening." With the combination of a random Steam sale knocking it down $20, and the fact that I had a friend who absolutely adored the game, I decided to try it. After realizing that, between the games and the dlcs, I'd spent about $85, and I had played 600 hours, I'd spent .14 cents per hour I changed my mind about that.
There are a lot of things about Bethesda games I really enjoy that apply to Skyrim. Bethesda's games encourage you to build your own experience, create your own story. Sure, there is a plot. There are quests. But you're free to ignore them. As I mentioned with Dishonored, you are welcome to determine your own play style. Plus, in Skyrim you can create your own character down to the bone. I like rpg games, and especially ones where you set up your own character, rather than the game doing it for you.
So, instead of talking about the game as a whole, which is largely impossible for Skyrim, I'm going to talk about questlines.
Dragon-killer: 7/10
The main quest. I rather like the main quest, but I do have one glaring issue with it: you cannot tell Delphine and Esburn to go fuck themselves. Sure, you could never talk to them again, but without mods, when they tell you to kill Paarthurnax, you can't tell them: "I'm the fucking dragonborn. You need me. I can just walk away and leave you to die, so shape the hell up."
Otherwise, I have no issues with the main quest. I have a lot of fun with it, from invading the Thalmor embassy to defeating Alduin.
Civil War: 9/10
Yes, I actually like the civil war quest better than the main quest. I like it for the thought put into it. As it has also been done to death, let me just quickly reiterate one thing: When one of the leaders can be compared to Hitler and to George Washington, clearly a lot of thought and work was put into it. The fact that people have been so divided over Stormcloaks vs Imperials is a good thing.
This quest encourages repeat playthroughs just so you can play both sides, but I remember thinking I didn't want to touch the Stormcloaks. Finally, one playthrough I did, and I really enjoyed it. It felt like the Stormcloaks were more rewarding, for some reason.
I like how gray the morality is. No matter which side you pick, parts of Skyrim will be better for it, and parts of Skyrim will be worse, with the thanes being replaced not always being better than their predecessors.
Companions: 4/10
One of the things I enjoy about Bethesda games is how smart the game is to how you play. Like in Dishonored, Skyrim has bits and pieces of this. However, the companions is where it falls flat.
Even if you have travelled across Skyrim and killed everything hostile from Riverwood to Windhelm, when you approach the companions your accomplishments will never be noticed. Farkas will still exclaim he's never heard of you, which wouldn't be too big of a deal in a setting where news doesn't travel fast... except you literally save Whiterun from a dragon.
You think he would have paid attention to that.
It's also greatly satisfying to avoid Whiterun until you have done some levelling up, so you can sneak in and kill the giant for them, which I don't think the game wanted you to be able to do. (I've only ever been able to do it as an archer, because if I get close enough to get a swing at it, it will already be dead.)
Companions is the first quest you come across that shows one of the issues I have with Skyrim's faction quest lines: You usually become the leader of the quest-line by the end.
I know it sounds like I totally hate this quest-line, but I don't. Kodlak, and his journal, save the quest-line. The werewolf thing doesn't hurt either.
Dark Brotherhood: 10/10
Out of the two Elder Scrolls games I've played, the dark brotherhood was the best quest-line in both of them. Admittedly, the Skyrim quest-line was worse than the Oblivion, but I honestly wonder how they could have topped some of the Oblivion Dark Brotherhood quests. (Getting locked into a house, and having to set up everyone else's death while making it look like you're not involved? AWESOME.)
The quest-line is well written, with amazing characters. The ending of it is very visceral and painful. Spoiler ends at next bold. When Astrid performed the black sacrament on herself, even after all she'd done, my execution of her was a healing spell.
...yes, my character was that bad at healing spells.
Thieves' Guild: 6.5/10
I don't know why I don't like this quest-line too much. It isn't bad. It's quite solid, in fact, and the nightingale armor is the coolest armor in the game. The characters aren't bad, and the storyline isn't bad.
It isn't Maven Black-Briar, whom I love to hate. The end of the quest-line is fantastic. I like how the side-quests encourage you to go out into the entire world, and you have to do more than a handful to advance. It also does feel like you earned becoming the boss this time. But out of the 600 hours I've spent in Skyrim, I have only played the Thieves' Guild quest-line once.
Once.
Dawnguard: 5/10
I got Dawnguard because the Oblivion DLCs really added a lot to the game, and Dawnguard didn't disappoint. I've done the Dawnguard quest-line twice. The snow-elf quest-line is the best part of it, and it was one of the things I remember mentioning in a conversation with someone about what I wanted out of Skyrim DLCs: looking into what happened to the Falmer.
That said, the Dawnguard quest is alright. Not bad, not good. Serana is one of the best followers in the game, if only because they were aware you would likely spend a lot of time with her, even if you didn't regularly have followers, and thus spent a lot of time on her AI and lines.
I think Dawnguard might have been more fun if you could have secretly been a vampire working for the Dawnguard. Sure, you can secretly be a werewolf, but it's just not as much fun.
That, and feeling like your initial decision really didn't matter. No matter which side you choose, the end is the same. (Unlike the civil war quest, where the 'end boss' is different depending on your side.)
I also want to give it props for the soul-cairn: Creepy stuff. I stopped using black soul gems after seeing it, and that's saying something.
Hearthfire DLC: 5/10
The hearthfire DLC appealed to me, in that I spend hours in Skyrim arranging my sword collection (not a euphemism), but I can see how it wouldn't appeal to a lot of people. I wish you had the ability to make the houses even bigger, by adding all the wings, but I understand why it was the way it was. I also wish it offered more customization; if you decide not to put in a table there's a clearly empty spot where the table should have been, and the place feels empty without it.
Though considering Skyrim's physics engine, perhaps it's best I ignore that wish.
I will acknowledge that modded houses have done better, and the child and marriage mechanic wasn't too solid to begin with, but it was only $5 full-price. I'm not going to scream rip-off.
Dragonborn: 7/10
I am angry this was the last DLC for Skyrim, seeing as my list wasn't done. (For DLCs I wanted one on the Thalmor, one on the Snow-Elves, and one on the Dwarves, at the very least.) That said, this was a great final addition to Skyrim. (Though I do wish all the armors added in with Dragonborn had a weapon-set to go with them.)
Meeting the first dragonborn is creepy, fighting him is creepier. The decisions aren't quite black or white, and it brought back Hermaeus Mora, giving him a proper Daedric quest. (His quest in vanilla skyrim was the weakest of all the Daedric quests.)
Skyrim was my first big game. It hasn't been the greatest game I've played, or the one that will stick with me forever, but it will always have a place in my heart.
Now make Fallout 4, Bethesda.