Metallica played live with a orchestra and sounded much better than most bands do when recorded with various voice correcters and stuff. I rate a song on; Good singing, good melody, difficulty to actually play/sing the song. I don\'t actually care much about the words. Anything that\'s just loud bass or has a guy screaming into a microphone sucks.
Oh yeah, I agree that dream theater are quite generic. But the music sounds good, and that\'s what matters.