I rather like IWD1 really. [img]smile.gif[/img] Sometimes it is nice to just have some brainless fun killing stuff. The music and scenery are top-notch, better than BG2's I would say, and though BG2 has the more robust storyline, I liked the twist at the end of the IWD saga, one of the best endings I have ever seen in a game.
I had a lot of fun in IWD, creating my ideal party and making them plod their way through the game. Of course, it helped that I gave them all custom scripts, so their actions were their own, though indirectly mine in a way. It is fun to see them battle on their own, like Sims War.