I have avoided Disturbed's cover of Sound of Silence up to now because even though I don't hate them, they're generally too synthetic and not raucous enough to be my kind of metal. I watched the Conan video. That cover was awesome. My only gripe was on the high notes, I heard the auto-tune kick in; if they'd have just let him overshoot the notes like he was doing for real, the performance would have been even more powerful. The "metal voice" part really worked well for me, and as tightly controlled as everything was in that song, a little "breakage" during the "pretty parts" would have only made it better.
RE: A Perfect Circle: Maynard is a douche with his head firmly up his own ass. That doesn't mean he can't put out good music, but like Tool, what was once a REALLY good band devolved into formulaic repetition. YAWN