nwn nights doesn't suck. it's not very good, but it doesn't suck either. and with the hordes of the underdark expansion, it just totally blows the original campaign away. lvl 40 max , new prestige classes, a host of new feats & abilities, etc. it has a lot going for it. god, have you seen a high-level prestige monk in action? he moves so damn fast, attacks so damn fast, while fighting unarmed. it's not even funny. i've played a dwarven defender, champion of torm, shifter and a host of other builds on the hotu campaign. and i must say i had a really great time. and to think i don't have any experience in pnp d&d nor am i too familiar w/ the d&d rules.
the hotu expansion just prolonged the replayability of nwn by a mile. have you taken a look at the hotu forums on bioware's site? it's bustling w/ activity, proof of the game's popularity. what we discuss here comparing several rpg games isn't as important as the actual sales of each game. that is the ultimate arbiter of how well a game is doing.
but still, the baldur's gate series is still the best rpg there is. <img src="/ubbthreads/images/graemlins/up.gif" alt="" />
p.s. w/ the upcoming releases of rpg's like jade empire on the xbox & dragon age on the pc, i believe bioware will be a fierce competitor in the rpg market.