[Agrajag]

Well, I played both MP and SP.
SP is just not fun (regardless of the campaign, I've tried all sorts of campaigns, I even borrowed a friend's expansion pack when those came out, and didn't really have much fun with it), maybe because as far as gameplay goes I'd really rather play a game like BG or IWD.
MP was fun for a while, but it gets boring fast when you mostly end up playing alone in a huge world, with other players playing alone somewhere else. Then the expansions came and I couldn't play any game because you had to have the expansions to enter most servers.