I've heard there are some bugs with certain quest givers not giving quests for some people, but that will apparently be fixed in patch 1.3 which is releasing soon from what I've heard. What kind of bugs are you having?
Quest won't start
Cult-member stuck in a place i couldn't get to her
Dialogue disappeared in cut-scenes
Icons disappeared on the map while on show gameplay-icons
Textures failed to load at times