The devil just got very cold!!
Never said they were the alpha and omega of music. I just like them because they know what they are, they put on a good show and they don't try to be something they're not. They don't tell me who I should vote for like some douchebags (Springsteen, Matthews, Dixies, half the country artists, and U2, for instance). They don't look down their noses at me or think I'm inferior because I don't subscribe to their particular political or economic views (Matthews again).
They just get on stage, play basic rock and roll and offer entertainment without strings. Except for the strings to your wallet as you purchase their licensed crap.
Ace is an excellent guitarist and inspired a number of guys like Slash and Eddie Van Halen. Something to be said for that.
Paul, who has limited vocal range, is a solid front man and helped change the way bands interact with their audiences.
Gene is the consummate narcissistic promoter, always thinking of bigger and better ways to build the show (and at the same time deplete your pockets by marketing the image). Gene completely altered the performance landscape. Along with bands/people like Alice Cooper, KISS was a driving force behind the elaborate shows that have elevated lesser bands and musicians. Garth Brooks, for instance, made a career out of his reputation as a live performer and did so by essentially copying the KISS shows he'd watched growing up.
Peter? Well, Pete's just a drummer. But he looks like a cat.