Meh, I don't really feel weird about liking them because of the kids music stuff because they've done plenty of adult albums by now. Haven't heard any of the kids music, though, so I don't know how far out there they got.
I'm more of a fan of their fun, peppy music overall. Stuff like, "Doctor Worm", "Experimental Film" or "The Cap'm" are some of their later stuff that's fun to listen to while driving around.