It really depends on your classes, talents. With some it's damn near impossible on hard, with others it's a cake walk.What difficulty did you play through on? Cause I chose hard and I am getting my ass whooped. Can't imagine getting through this game as fast as you've stated, unless you did it on easy.
I've had fun with it, and I can deal with the bugs, I don't think they're that gamebreaking if you managed them sensibility. But it does feel like the longer one goes through it, the weaker the story/game becomes. It's a shame, because it is a great game. But with a little more effort it could have been a lot better. Kind of like Vanilla WoW, the start was great, then the further you go, the less and less finished it is.