21CBD was not their best but still had so many good tracks (just no great ones, I felt).
American Idiot dropped shortly after I got into pop punk and realised Green Day were the pick of the bunch, and is still probably my favourite record.
Warning before that, my second favourite.
And I love their old shit (Slappy EP, Kerplunk, et al)
Everything up to and including Warning still holds up really well...everything after is utterly unlistenable for me, no matter how hard I try. Here's to hoping they've gotten bored with these half assed anthems and write something decent again :)