I've had no problem with any quests either. Going for Seeker so I've been doing almot every quest in each zone minus the instance ones (for now at least)
Yar, they fixed most of the quests that were bugged.
I've been through 10 man naxx, malygoose, sartharion. We are going to 25 man Archadeon on monday. I'm already in all 80 epics minus a few items. Rolling a resto shaman so I can heal now. My dk is level 63.
So far I'm of the opinion that Blizzard has made things too easy. Every level 80 I see is in full level 80 epics. Quests so far have been STUPIDLY easy at times. Droprates on quest items have been pretty much made 100% for most quests (which I'm not against, because I dislike the "grind" of the game) and group quests are mostly nonexistant and when they do exist they're not really group quests because they're so easy.
Basically, Blizzard is trying to make the game more "casual" friendly but they don't realize that "casual" doesn't mean "retarded." I'm all for making quests and dungeons take less time, but I don't like that they're making them so easy that you can faceroll through them.