I know drumming, I am not a drummer but I have been playing for 5 years, I am a guitarist of which I have been playing for 10 years, I know good drumming when I here it, He is a good drummer but not the best, and his drumming on that song is not unbelievable, it is quite simple, listen to anything Richard Christy, Sean Reinert, Pete Sandoval, Flo Mounier, Dave Lombardo, and many other drummers that completely obliteraie Charlie in the drumming department, I love Anthrax but just because they are your favorite band doesn't mean that they are the best musicians.