Can only echo Cerns comments really. I also found it because a bit samey - i always came across those dark portal type things in the wilderness and my first thought was 'oh no, not another one'

I also think i suffer in games with a real open environment. It may sound silly but I like a storyline with alternate choices/endings (not linear though), rather than something so open as I kind of feel a bit goal-less. I know there was the central story, but i did not really find that so engaging and like cern i ended up finding it too hard.
Another point i'd add is i did not get to grips with the entire character class system etc.
Slightly off topic, I persisted over Christmas with NWN2 and actually found despite the annoying camera and mind boggling bad AI (at times) the story was actually pretty good. By the time i completed the campaign i was actually pretty bored, but it kept me going for a while - mostly because after playing DDO last year I'm much more familiar with the d&d ruleset now i guess.