I think Tre is awesome drummer. Not the greatest.
If you think Green Day songs are simple or easy try playing them making faces and jumping around.
Green Day also has a whole bunch cover songs...ex Rolling Stones, Marylin Manson, Elvis Presley, The Cure, The Who, Operation Ivy, Billy Idol, Sex Pistols, Black Sabbath, Metallica, Def Leppard, The Ramones, Queen, Led Zeppelin, The Ramones etc...
So Tre can play more then just "punk" or w/e you guys call it. Go to http://www.greendayauthority.com/TheBand/songlist.shtml
for the whole list.
Tre also played with The Lookouts, Sreeching Weasels, and Samiam.
You can probably download some of these songs.
I think you guys should listen to more than just what he played in Green Day before you judge how good a drummer he is.
I also heard a drum solo he played. I probably still have it on my computer somewhere.