There are indeed bugs in the game. The most annoying bugs are plot stoppers, which are available in Act2, 3 and 4. The plot stoppers in Act 2 and 3 seems to be fixed in the first patch. Some people still have problems with the copy protection.
There are also a lot of very little issues (like updating the quests in the questbook in the filtered options etc.) but you can play the game and with the patch then you have more fun than before. I must really admit, there there's a high rate of quests in the game and it's hard to get it bugfree, it's simply too complex.
As far as I can say Act 4 has really genius quest and puzzle design, haven't seen such a quality for a long time in the RPG genre <img src="/ubbthreads/images/graemlins/up.gif" alt="" />
