I've never found it a problem, using commands and common sense. the pathfinding of party members in NWN 2 is something that always bothered me, and there are obvious interaction bugs that still haven't been taken care of, but it's still infinitely better than dungeon siege, why? Because the things causing all those problems are the things dungeon siege doesn't have... the indoor questing and pathfinding, the traps, the interaction between party members... In fact, nothing about NWN's party system really bugged me at all, it was mostly the graphics, colors, a few bugs and animations that annoyed me.
I have to say, I don't mind taking a few more hits due to bad AI and I don't mind having my party members walk into a trap or two, if it's a trade off for an infinitely more interesting and profound gaming experience.
If you want a party based game where your party members' AI is the best, play Demon Stone. You'll usually be the weaker link in your party, whichever one you're playing. It doesn't make the game more fun... in fact, it makes it less fun.
But don't put Dungeon Siege in the same league as NWN. It would be an affront to RPG's.
