Peart is a good drummer maybe a great one but definitely the most over-rated out there.
Like someone said the best drummers are jazzers- Tony Williams is probably my favourite.
Rock-wise, Bonham was great, Ginger Baker, Mitch Mitchell, Keith Moon- far less technically proficient than a lot of guys but still a great player, Dave Grohl is great to see live. Bill Ward of Black Sabbath/Heaven and Hell is a very under-rated drummer.
lars ulrich is not even worth mentioning. Way over-hyped, terrible drum sound, and of course a c$%t