A great roleplaying game, but....
The main "flaw" is the steep technical requirements, absurd processor requirements, I can personally run it with minor choppiness without turning everything off but you need a monster machine if you want to turn on EVERYTHING.
Camera angles are, at best, below average. Sometimes it not only gets stuck in buildings in normal view, but sometimes cutscenes may act oddly (I got a ground shot once...maybe it was just me).
It LOOKS great unless you look REALLY hard. Minor things so I think, it is up to you to decide. Totally authentic as far as D&D is concerned, they filled in lots of gaps that Neverwinter Nights did not have, but again, some things like blind-sense do not translate well to a video game.
They made some wonderful characters and although I am not extremely far in the game, what I SAW and HEARD was pretty great, except some sounds, voices and chants were rehashed and reused from what I have experienced. Overall, I think it was worth the money, to me, but maybe not to you. Take this with a grain of salt and if you want more of an opinion just ask, I tried my best, heh.