Interesting, I liked Calebs vocals on it.. I didn't notice a difference. Come on Chad Kroeger that is low. Anyways Pyro is one of my favorite songs of KOL's. I guess its time to listen to the album for the 20th time and get back to you. I hope I don't see it in a different light.
If anything without listening to it again, it sounded as if they are just progressing in a different way that you expect, or would like. They are progressing as they want. Anyways they were popular in Britain years before the US and they didn't sell out. Well putting my disc in right now. I'll be back
EDIT: Yep I stand by my opinion, still a great album IMO.