I agree with you on this.
I went into this album thinking I was going to hate it, telling everyone I can not believe they would put out an album like this. When in reality I absolutely love about half the album. I can listen to PTL over and over again, Collapsible lung would be my next favorite.
I greatly disliked Lost Boy when I first heard it, but now I love it and can not stop singing it. It is just too damn catchy.
Relient K always have songs on their albums that are silly and poppy, that is kind of who they are, and they like to play around with different sounds.