I prefer songs that tie into the show but don't actually get too specific about them, something about a lot of the older songs seem so cheesy to me, and yes, I know this is a show about men in bug suits fighting rubber monsters, but even still, I wasn't too big of a fan of those songs...though I did like a lot of the insert songs.
Though, I agree with Iga that they really do need to say "Kamen Rider" in the show at least a couple of times.