I was a big fan when I was younger. I even admit that I still think their first album was great - it sounded like someone had recorded pure anger - but each album that followed was incrementally less good. There were some bright spots on later albums, but they never recaptured the insanity and aggression of that first one. Every so often I'll listen to some of their stuff, the first album in particular, in a fit of nostalgia. However, I'm a lot less angry at 30 than I was at 20, so I don't really relate to it anymore.
I still listen to Stone Sour pretty regularly, though. I was really into metal when I was younger, so my taste for it hasn't completely gone away, but I just don't dig SlipKnot's angst like I used to. Stone Sour fills this place quite nicely; it's like SlipKnot for metal heads who aren't quite so metal anymore.