Good and not very innapropriate just sorta bad themed. It was like my favorite song in 4th grade. I really like it. Not so much now though, but its still on my itouch.
Actually, I think this song doesn't have a good or bad message. Just a sad one. Depending on how it's interpreted, it can be a song about how this guy has a problem of not being a good bf, and he's warning girls "I'm not the perfect person".