Kiss have written a handful or two memorable songs in a three decade career, Detroit Rock City being one of them though I credit much of that to Bob Ezrin who according to Gene Simmons came up with both the carcrash noises, the bass run (painstakingly shown to Gene who had a hard time getting its non-triolic feel over the shuffle rhythm) and the minor mode solo with thirds (he hummed the melody to Kiss, which at the time of recording Destroyer did not even know that you could tune a guitar via its harmonics, source for this: Gene Simmons' bio). Take those ingredients away and there is not much left of Detroit Rock City. But I'm not knocking Kiss, they were always upfront that their show was more than 50% of their concept and that the brand empire they created had little to do with their often pedestrian and heavy-handed music. But you don't need to go to someone as blatantly show-oriented as Kiss to find that a good show sells. Ever wondered why the Stones still sell out stadiums to dwindling album sales while a band such as the Yardbirds broke up decades ago? Mick Jagger is live no less of a showman than Paul Stanley and without him the Stones would be playing bars rather than stadiums.
As regards the guitar smashing thing. If it's done out of frenzy (Hendrix) or frustration (Cobain) or a ritual act like stabbing the steer at a bullfight (Blackmore) or initially just an ugly accident (Townshend), it has a different meaning to me than if it is part of the regular act (Kiss) where it is essentially just another smoke bomb going off. That doesn't make Kiss less worthy musicians though, anybody having read an interview with Paul Stanley about his signature guitars (and why he hates to have his old signature model belittled as an Iceman "when it has nothing to with an Iceman as regards quality"), knows that the guy has an appreciation for instruments. He probably flinched at destroying those guitars, but gave the people what they wanted: bread and games. How Kiss really feel about destroying things showed when according to Manfred Mann (opening act for them at the time) they threw the second opening act, an unnamed Brit band (I have a hunch it was Dr Feelgood at the time) unceremoniously off the tour for wrecking just one hotel room with Kiss profusely apologizing to the hotel management for the misdemeanor of their opening act. If you come from a less than affluent background in Queens, you don't break things on purpose unless people want you to and pay you for it!