I don't know what you guys are smoking, but comparing NWN to BG is an insult to BG. (edit: I mean, BG as a series)
But well, the OC of NWN and NWN 2 is just too bad and I don't bother to get the X packs, may be I missed something.

BG, based on AD&D, has
- Complex (if not TOO complex for kids nowadays) combat experience. I still remember all the spell counters.
- Hard combat that involves using your ability (a.k.a. your brain) instead of grinding exp.
- Character advancement that isn't just looting "shinnies". Epic levels that's really EPIC

NWN? I steamrolled it with a barbarian and never looked back, it is easy, simple, it can be translated to a hack n' slash game easily.
NWN2? I *think* I played it with my friend. But sadly I can't even remember if I finished it. You can tell how *good* a game it is, I think.
edit: Oh and not to mention, the loading times.

Ok back to DA.
No multiplayer? How could it be BG if it doesn't have multiplayer?
End of discussion.