Freak Kitchen has personality, you can tell they're having fun at what they do (which is ripping off king's x , ha ha ha). Mahavishnu orchestra, those guys play with passion and attitude (well they did for a while, until they couldn't get along and it shows in latter days). King Crimson, same thing, emotion. But they don't play complex for the sake of playing complex (for the most part, it's not their main focus anyway)
Also, re: Dream Theater, I think complexity and technicality are being used interchangeably here, and I believe that's would make a similar yet interesting argument as well! and perhaps even more valid for the direction thoughts are heading.
Does music have to be technically proficient to be good?