Here's my theory. When most bands record an album they record a bunch of songs. Then they select the best ones and refine them. Green Day said screw it. Let's release em all. Is that cool? I think so because you get some songs that you might like that would have been cut. On they other hand, you get some not so great songs. There's probably a great 12 song album between all three albums, but you gotta find it yourself.
So far they've written like six good songs and six songs good enough to be filler.