I can't remember which Beatle said it, but he basically said that Ringo was the second best drummer in the Beatles, next to Paul. Paul did the drums on "The Ballad of John and Yoko", and he played all the instruments on his first solo album "McCartney", the one with "Maybe I'm Amazed."
The drumming on “Rain” was his best work - quite inventive within the scope of the Beatles recordings.
http://www.youtube.com/watch?v=MPjDMZiuhbQ