PLEASE PLEASE PLEASE try this game with community patch 1.71. - and kiss your social life good-bye.
The combat and AI are still not great, but who cares if you have such a massive non-linear world to explore? The landscape is beautifully hand-crafted (unlike computer-generated Oblivion) and feels real. The quests make sense, the music is great as is known for this series.
Bad points are: still system hog, poor animation, bad voice acting, bad combat. However, for me they are far outweighed by the good points. Now, bring on RISEN.