I'm not asking for everything all at once but the most common ones need to be addressed in the next patch or people will just phase out of playing.
The game was released quite a while ago now.
Blood on the Ice springs to mind.
Also the numerous bugs in several steps of the various thieves guild quests.
Lots of people getting stung on houses, Markarth steward failing to offer purchase is a common one and Windhelm house because of Blood on the Ice (I swear, fix that one questline and a LOT of stuff will fall into place.)
imo they need to radically expand the scope of possible player actions for quests... for example Petra the Hagraven.
That quest is bugged purely because whoever wrote it failed to predict that players may choose not to release a vicious hagraven from a cage and kill the sister alone instead.
(and considering the cage itself shows an action prompt that does nothing while the actual release is an easy to miss chain hanging off to the side, somebody really dropped the ball on this one).
That's poor writing, nothing more.
Quite a few quests are bugged because of failure to provide enough outcomes for potential actions by the player.
In a game where freedom is king, this is a real recipie for disaster which we have all tasted by now, in some form or other.
So yeah... quests please.