In one word: yes.
...almost every D&D computer game i've played was better than NWN.
I've only played a few chapters of NWN. The training, cleaning NWN and a few places after this, so take my opinion for what it's worth. I hadn't the will to play further because a) i was bored and b) i have an underspecked computer.
IM not so humble O, NWN pretends to be a RP g when it's only a D&D bashthrough.
Or at best a rpg with a very poor scenario (think Gary Gigax first aventures) and cheesy quests you'd want to have finished already. Problem is, combats can get a bit boring in single-player. Not much possible strategy patterns apart from the best one for your only char. Also, combats were absolutly not challenging (even with my halfling 50%/50% druid-rogue). My hope for NWN rests on the shoulders of the modmakers who might built something with a story scope similar to fallout/BG1-2.
IWD2 is designed to be a bashthrough, it doesn't pretend to be something else. All the challenge rests on combat balance and, as stated in the other posts, the devs have done a good job on this aspect. Almost every fight is a tough one, and this comes from a hardcore IE fan.
Basically, if you enjoyed IWD with its scores of monsters and infinite snowfields, and if NWN let you down, you'll prefer IWD2 over the overhyped, overpriced RP-wanabe g.