Rob's good, but com'n guys... one of the best? I don't know about that. He's good good rythm, but I can't think of anything he plays that is all that intricate.
Easier To Run is intricate, kind of... but yeah, he is very good at rhythm. Mike Bordin of Faith No More is my favourite.
I've seen a couple people put Lars from Metallica. I have to criticize Lars for a couple reasons. He's a good drummer, I admit that. But if you listen to him playing with Metallica, he's offbeat quite often. I just don't think he fits in well with a band because he's not good at keeping a steady rhythm. He could pull off some kickass drum solos, but especially live, he plays some fills that don't fit at all with the rest of the band. 2 more guys I gotta add: Keith Moon (The Who) and Tre Cool (Green Day).