A lot of people put down Coheed simply because they do not like the singer's voice. Their musical talent and scope of their collective discography (in terms of their unique and ambitious nature) is nothing to discount.
I happen to like Coheed and Cambria. They are by no means my favorite band. I rarely search them out on my iPod and listen to them, but imagine if they had another singer (if that is, indeed, what bothers you about them) and then try and complain about the music. Listen to the song Light and the Glass and tell me it's bad music. What a gorgeous song.
I do not think they are Rush "rip offs" per se, but there is a similarity.
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