If they were shit, as some of you think, they wouldn't be so hugely successful. Some of my friends that like KISS have played in bands and recorded records, another is a classical and opera buff as well as a rock fan - they are not people who tolerate bands that are actaully shit.
I can't speak for anyone else but I don't think they are funny but they are fun, which is entirely their intention.
I mentioned the KISS principle before but it absolutely applies to the band: keep it simple stupid could be their credo.
They reall would look stupid is they went out and tried to play music like Rush made up and dressed as they are with the kind of show they put on. The music and lyrics are simple by design. They are a party hearty on a Saturday night band - not that all their fans (e.g. me) fall into that category and band members that did were exited.
They are very smart, professional guys who have come with a package that works. It's not cynical though, Simmons and Stanley love music and what they do, they long since needed to do it for the money.