^I think I enjoyed SCII a little bit more. I wish there was a bit more depth to SCIV's game modes; the tower thing gets to be very not fun after a while, and there's not much beyond that (and the arcade and story modes, obviously). Also, back when I was playing the game a lot, the Sith Apprentice was terribly broken, which was also not very fun to play against.
But playing multiplayer with my friend was fun; I never tried random online playing, though.