I agree that nothing after american idiot can top the previous stuff. But 21st Cb was still a pretty solid record imo. And the Trilogy could have been if they had picked out the strongest songs and only released one record instead of three. RevRad was quite boring, I'll give you that.
Foam still stands out to me, even after several listens. It's nothing groundbreaking but it's refreshing and catchy and fun. It's very surprising to me that it gets so much hate.