The only reason most of you say One Piece's theme is worse is because most of you don't like rap music, and that it's your favorite show.
Well, you know the first thing doesn't apply to me, and yeah, the second really matters. I don't feel a weak show should get the same treatment as a good one.
GT has a much more worse off song than One Piece. It's a bad rap, it isn't funny or catchy. At least the One Piece intro has that. And Rave Master's theme is horrible. A bad song is a bad song…. It doesn't make it worse just because YOU think the anime who has it is better than the other. That will be an opinion.
Yeah, because OP's theme is catchy and funny. And the Rave song is simply bad. Those are opinions as well. I know people who like that "Rave about it" song, and I can't imagine anyone getting the OP song stuck in their head unless they listen to awful rap anyway.