most of the slipknot hate is image related and has absolutely nothing to do with the music at all.
i'm no fan of the band, but IOWA was in many ways a good piece of work particularly in the rhythmic department. Also, their singer is one of the best, most diverse screamers i've ever heard.
but yeah. the blanket hate that slipknot receive is unrelated to the album music, which most people who talk bad of them have never even listened to so much as a second of.
but then, slipknot's image is so repulsively detestable and abhorrent and their fanbase is so unbelievably sad-a$s that it almost justifies hating the band and their music...just 'cause.