I hated Slipknot because I thought they were nu-metal shit, and to an extent the album "Slipknot" IS. But "Iowa" is a fucking masterpiece - there's no way it's nu-metal, songs like "Heretic Anthem" and "Gently" are classic slabs of pure metal.
Honestly, if anyone here hasn't gave "Iowa" a fair chance, you really should, it's a great record.
I think a lot of people just bash Slipknot because 4 year old children wear their shirts and they have this commercial image. But the music on "Iowa" deserves a listen, and if Slipknot bring more youngsters into the metal fold, I'm all for them. We all had to start somewher (Bon Jovi and G N' R in my case).