Well...I'm level 47, 100+ hours into the game, and my save gave file is only 1MB. I have no clue why the second play-through is so much more stable, but I'm absolutely in love with this game. No lag/b. roken quests etc.
As with all games, Skyrim is not "perfect". It roughly touches the RPG elements, but true role playing, and the effect the characters actions have on the world are sorely lacking. This is my only real complaint now. The pros for this game are far too numerous to list, but some of the cons I have experienced (some very minor) should be openly discussed to help improve the game.
1) Your characters actions have no real effect on the world. This is particularly obvious with the guild accomplishments.
2) Companions should be redone. How awesome would it be to have back stories and quests for your companions (like mass effect 2). I would also love the ability to have more than one companion. The other night I had Brelyna from the mages guild with me, and we were on top of a mountain peak, looking down into a snow filled valley, and I thought to myself "how awesome would it be to have a "party" with me right now...the addition of a warrior to my "party" would have given an epic feeling.
3) guild quests a bit short....well done but short
4) Inability to truly decorate my home....not have the Jarl do it for me.
I'm hoping for the ability to build a home and/or castle. This would be epic. It should be hard, take a long time, cost a lot of money, etc. There should be quests for it, like mining ore, harvesting timber etc. You could also put guards on your payroll, your followers would move in etc. Something similar to Never Winter Nights.
All in all...since the lag issue (for me at least) seems to no longer be a problem I am absolutely loving Skyrim. It's one of the most immersive, addicting, and overall impressive games i have ever played. It's close to perfect...nothing some patches and DLC can't fix. Wish I had it on PC so I could use the mods. BUT...I'm a console player. Whoah is me.

So damn, hard. It is pretty fun though.