I don't play a lot of CRPGs, but I'd heard this one was great. It's definitely oozing with the warhammer style and there's lot of different ways to build your character and party.
It's shocking how much depth is in this game from 2003. The ability to go off the beaten path and do what you want is top-tier.
The game does have some bugs, namely an "OutOfMemory" that crashes the game, so make sure you save often.