I had so many problems with their dynamically-generated-quest system (which they amusingly used for story and faction quests as well instead of having two systems) that it was no laughing matter at all. After reading a hundred different 'fixes', none of which worked even after ten hours of screwing with the console, I still haven't done any of the Bards College quests since the chain-starter is bugged for me.
I'm also annoyed that after so many years of faction-split RPG games, starting with the original Fallout, nobody's figured out how to create a unique questing experience in over a decade. It's either "you joined Faction A so you can't join Faction B, since we'll be killing most of them off later anyways" or "you can join every faction and your experiences within them are independent of everything else going on in the game". Is that really all that we're limited to for faction-based games?
I want to see something akin to the Fallout New Vegas factional influence on the end-game, except beyond a single battle, something that affects events throughout the game from start to finish at key points based on what you've done with ALL of the factions, not just a single one. I want to see storyline where it doesn't feel as if I'm stepping from one game to another whenever I do something for the Mage's Guild, the Warrior's Guild, of the Thieve's Guild- something where it feels like my choices ANYWHERE affect the story EVERYWHERE. *sighs*