I wasn't actually responding to your post.
About SoaD not being metal, wikipedia refers to them as "alternative metal", but despite it's name, that genre isn't really metal (just like nu metal isn't metal), so yeah, they're not metal. Sliknot is nu metal, in other words not real metal either. Some other non-metal bands I've seen confused with the metal genre are Queens of the Stone Age, My Chemical Romance, Guns 'n' Roses, Korn and even AC/DC. And a lot more I forgot, of course.