Go to a Tool concert and tell me they are overrated... Maynard has an amazing voice, Danny is one best drummers out there, no one is as fast as he is. And Adam has his own muted guitar style that he came up with in lateralus that complements Maynard perfectly. It's easy to say they are overrated when you aren't paying attention to the lyrics and just the powerchords...
Almost everything mainstream except a few bands these days are overrated, most of the best music I've heard are from bands/artists who are relatively unknown. I remember seeing Intepol at a club in NY when no one even knew who they were