Ugh, like insane amounts of variables with all the classes, prestige classes, spells, races etc. wouldn't already create enough bugs. And no mystic Theurge plz.
I'm way more interested in quality storytelling, interesting battles, great art direction (MotB's beat NWN2 OC's easily) etc. instead of MOAR MOAR MOAR STUFF.
Of course, more stuff is always welcome but resources are limited and adding 15 different new prc's isn't something I would use them if I have to make choices. Wasn't it said somewhere that NWN2 "vanilla" tried to bite too much cake - having all the same things NWN1 did (minus epic levels & things related tot hem) but also having way more complex toolset, better singleplayer campaign, subraces AND pile of PrC's which didn't come in NWN1 until SoU