My worst experiences have been dialogue related. Such things as being called Brynjolf's new protege all the time when u are the head of the thieves guild, new guy at the college when u are arch mage, and similar. Then there is the fact that in order to adopt a child from the orphanage in Hearthfire, u must have killed Grelod beforehand. Like when do they let murderers adopt children? There are a lot of inconsistencies of various types in the game. And there are not enough dialogue choices for the characters either. How many times do u hear the "lollygagging", "sweetroll", "hail sithis", etc etc repeated ad nauseum. Still, all of this is relative minor and really doesn't detract from the game too badly. It really just amuses me more than it irritates.