The bugs,glitches and freezing.
More locations that add uniqueness.I don't want to constantly see metro or power stations and destroyed buildings with the same inside.
This is another good one.
I fricking hated this in Oblivion. If I sneak into a guy's house when no one is looking and very quietly bludgeon him to death before he can start shouting, I shouldn't have the whole damn town coming down on me like I just strangled a puppy in the town square. Theres just no way they could know.
Oh how I hated this.Sometimes they wouldn't be looking for me but that rarely happened.They always knew exactly where I was even though they weren't even close to me.There wouldn't have been a point to hide from them if they're still able to find you.