I'm sure Lars Ulrich will be mentioned if he hasn't been already, I know many much better drummers but for Metallica I wouldn't want any other drummer. his "style" definitely fits the band.If you know what I mean...
For example, Ringo is not technically great in many ways, but nevertheless he is GREAT. He overcomes whatever skills he may lack with creativity and feel and playing cool licks and playing the right thing for the song, etc etc etc.
Who else do you think is great like that?