Well a lot of things listing skyrim but skyrim is still good but just some things are just not good. Make it so there isnt like 10 different voicing people and then everybody has the same voice add more custom voiced people. Make it so the Saturation is higher it just feels like it should be like that, like immersive saturation boost it should look like that. And thats it so far. Also add more weapons and armors since it got really badly robbed of its weapons and armors. That might not fix everything but the main things pretty much.

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I guess TES's weakest point was always the combat system. I quite like it myself, but I agree that it can get boring after a while, mainly if you're playing a warrior character (if it's a sword and board character it's even worse).
Many people want TES to take the Dark Souls aproach, with a lot of rolling and dodging, but what I like about TES current combat system is that it doesn't feel like the character is an olympic gymnast, it just feels and plays more feasible.
I think that spicing up the combat would be very nice, but without making it feel like a platformer.

The AI. Seriously, through all 5 games, the AI has always been a pain in my backside. The AI has problems such as, enemies stuck in walls, brain dead npcs and for Skyrim, the dragons are stupid. They have to circle around u before attacking u. Where's the logic in that.