Personally I don't like them but why should you be ashamed or look guilty?! If you like it, you like it - simple as that. I don't hold with all this "guilty pleasure" nonsense, which now seems to have become an industry in its own right .
We're too shackled by what's deemed cool or not by the media, our friends, etc. I love (among many other, very varied things) early Genesis - 70s prog rock, possibly the most maligned and uncool thing, if you believe the music press. Do I care? Do I b*ll*cks! And neither should you, regarding your Dolls fixation. Dance and sing away, I say.