I have no problem with putting American Idiot on a Top 10 of the Decade list.

In absolutely no order at all...
The aforementioned Idiot
Radiohead... Kid A
Built to Spill... Ancient Melodies of the Future
My Morning Jacket... Z
New Pornographers... Twin Cinema
Spoon... Gimme Fiction
REM... Accelerate
Porcupine Tree... Deadwing
Arcade Fire... Funeral
Wilco... YHF

I feel pretty good about that list. Throw in PJ Harvey's Stories from the City... as an honorable mention, if you like.