LP drums are not hard. But they never intended to be (maybe in The Hunting Party).
Rob knew how to play for the song, or "in the pocket". He didn't have much finesse, or volume/speed dynamics. He's more of a "locked on" player, straightforward.
But that's what LP songs are... straightforward. Many LP songs have the same groove/beat through the whole song, just differing on the bridge, the chorus being just the verse with hit-hat open or something like that.
Many LP songs from HT/MT era have a 16th hi-hat sample beat, but Rob is really playing 8ths under it. This is one of the "Linkin Park tricks to sound like Linkin Park".
About my top 5, not in order:
Papercut has a great beat. It's hip hopish, it's metalish, it's punkish... it's pure "hybrid theory".
Somewhere i Belong has a very nice groove and some cool licks.
GATS was the first time we heard "all his potential".
The Little Things Give You Away is weird, i like that a lot.
The Catalyst is a little hard to play, the beat seems offtime. The kickdrum pattern if fucked up over that punk beat on the hands.
Not gonna mention Easier To Run cause this is the one everyone mentions.