Yeah, the Sonic X theme is pretty bad, but the shows' not much better, IMHO. In fact, a lot of the 4Kids' themes are kind of a pain on the ol' ears, IMO.
One OK show with a questionable opening for me is WB's Legion of Superheroes. It's not really bad per se, but to me the opening theme sounds more appropriate for a 70's prime-time cop show than a Saturday morning cartoon about superheroes. I keep expecting to hear an announcer say "A Quinn-Martin production" at the end. :anime: