In rock and roll, the appearance and the personality of the musician is almost more important than their ability. It's a fashion show out there. That doesn't mean that there aren't great musicians, but THAT seems to come second to the public. It's sort of like: If you're not a
knock-dead gorgeous hot babe, forget a career in country music.
Other genres of music aren't as superficial. Jazz, blues,folk, classical and world music are more interested in musicianship alone.
I am in awe of the technical ability of Buddy Rich and I loved watching him play and showing off his skills, but I found the music very unrewarding because it was always all about Buddy and no one else. In that same genre of "big band swing" I really like Louis Bellson as a drummer. In the Jazz world, there are really awesome creative people like Elvin Jones and Tony Williams (among a ton of others) that advanced the art of drumming.
Ringo Starr is a perfectly good drummer for what he was doing. He was part of that old school of drummers that provided
a back beat to the group and did nothing to stand out. Charlie Watts is in that same school. A drummer that is in that same school of thinking but manages to really stand out because of incredible musicianship is Steve Gadd. This drummer has all the awesome chops that we all respect, but never once hogs the limelight. It's always about serving the music. He provides one of the most solid on the mark grooves of any drummer I've ever heard.
Stewart Copeland is a good drummer, but far from great. If he's all that friggin' wonderful, then why did Sting hire Vinnie Colaiuta to cover him on a lot of recordings. (Vinnie Colaiuta is a personal favorite of mine). How about Terry Lynn Carrington or Cindy Blackman? (great stuff coming out of those ladies).
Another personal favorite of mine (and a friend) is Jeff Tain Watts. I don't know if he's one of the best drummers ever, but I like him and he never disappoints.
And now for the 800 lb. gorilla in the room. Why has nobody mentioned John Bonham? That drummer almost singlehandedly revolutionized rock drumming. He is still as revered today as Jimi Hendrix is as a guitarist by even young musicians.