Plastic Beach is better for the simple fact that it contains Sweepstakes. I've come to learn that a lot of people dislike that song a great deal, which blows my mind. Mos Def is aces and the production on that track is brilliant.
Sure, but I wouldn't call PB "falling off." Still, Gorillaz still makes bangers these days, even if the albums themselves aren't as good. Desolé slaps.