MF DOOM is on the list. He's above average, but well below Aes or most of Wu-Tang. I've listened to a fair number of rappers, and I was pretty confident Aes would be at the top of this list.

I agree it would be cool to see a list of all rappers, though. I was surprised not to see Del, and maybe there is some more obscure rapper I'm not thinking of with a broader vocabulary than Aes.