From the start NWN was marketed as basicly a virtual table. One of the big selling points was the ability to acualy play a user made moduel with a group of people and someone on the DM client. NWN connections sets up games.. and if you do those, or some of the better single player mods, its good. All in all i think the game is worth it, simply becaus the fact that its SO easy to make mods means that every day theres a new one comeing out... so you always have SOMETHING new to do. There are some verry good moduels out there, from short 1 hour moduels, to things that last houres, and in development are real 40+ hour long games. And iv always said that if youv got nothing better to do.. the OC is an ok way to kill a few days..
The best way to play dungeon siege is just make everyone into an archer and pass out.. you will eventualy find that you have finished then you can marvel at the pretty graphics and put the game away=P I acualy think the story of its included multiplayer world is better than the single... but i cant for the life of me remember what it was...