There is a LOT that could be changed/improved/altered whatever have you with this game, but magic is something that I'd like to see improved...
Magic is terribly weak. I made a magic only character and from the get go it's been crazy hard to fight battles. At first it's understandable...but even with the archmage robes and dragon priest masks it's hard to get involved in magic so much. Spells cost a lot, regen is hard to come across...
Also, the controls aren't really fit for the mage type. In the next game, it would be nice to have a "control scheme" that is directed at each class... archery, thieving, mage, warrior etc.
Next, I'd like to talk about enchanting... we have a few enchanting options in this game, but we can't make objects as godly as say... the arch mage robes or even some random items you find on the ground. I tried to enchant a full daedric set with destruction/magica regen with a grand soul gem and a enchanting potion...and both numbers were like 10%... normal destruction or magika regen have decently high stats, but still not as good as the dragon priest/arch mage robes combo.
Last but not least I have a huge problem with skill points. There are 81 levels in this game (odd cap) meaning 81 skill points...I've used my points ultra conservatively only putting points there would help my playstyle/experience with the game...and I'm running crazy short on points.

wanted so badly for us to use those damned dragon shouts, that they decided to nerf destruction. Are they completely oblivious to the fact that many players (myself included) sometimes ignore the main quest entirely and thus need destruction in all it's (former) glory. And what about those folks that want to go as a destruction specialist, but don't wish to use exploits to make it a viable school again. Seems to me, that if they are going to be giving us those exploits to make up for it's weakness, they should've never have nerfed it in the first place. That way they could've kept the necessary (destruction) exploits out of the game.
I am just speaking to the choir. 