To be honest, Swordscythe, the original NWN campaign was SO awful there's no chance of me trying it again. I DID get talked into trying the sequels, though, and although they are nowhere near being in the league of the Baldur's Gate games, let alone PS:T, I found them both playable and Hordes Of The Underdark was actually rather good.
NWN2 original campaign is OK rather than great, and I found Mask quite boring, but neither belongs on a worst list, to me. Storm of Zehir is actually good, and arguably the best of all the NWN games to date.
As for Witcher, you'll have real trouble making a moral decision as such, considering that a lot of the time you are faced with 'least worst' and skill allocation is actually crucial. I'm starting to think there are two games called The Witcher, because the one you describe is not the one I played.
I didn't find NWN2 to be unbalanced at all, so I suspect that we are bringing very different strengths and weaknesses to these games, hence the immense gulf between our opinions of them. I could throw a lot of criticisms at NWN2, from the railway tracks that direct your every movement to the stupidly limited party size, to the sheer annoyance of not being able to get full party control. But it's more irritating than outright bad.
I just hope if there are ever any more NWN games that the makers actually pay attention to the system they're using, rather than try to create the next Diablo with a completely inappropriate system, again. Storm Of Zehir is certainly a very promising step in the right direction.
