Actually on the super-spam list you usually end up with whatever shit happens to pass through the minds of those already on it.
Yes the NWN is excellent, we had 4 of us go through the official game from start to finish in a party in a regularly scheduled weekly game. Took us 4 months or something but it was fantastic!
5 is the most you want to have in a party or it becomes too chaotic in voice, and frankly too easy to kill the baddies as you tend to almost outnumber them.
Proof that stupidity and experience aren't mutually exclusive