i dont think Joey himself would claim to be anywhere near the best Metal drummer out there, still he is pretty fucking good!!
out of interest, what makes a drummer one dimensional? especially when your playing death metal stuff like slipknot, they are hardly known for their experimentation with styles. that guy 2 posts back is pretty amazing like, although the stuff he does wtih his feet is very similar to most metal drummers but the shit with the snare drum and the hi hat cymbol is amazing. this guy for me is the best drummer i have ever seen, if you can ignore the stupid beatbox guy and just watch the drummer.