Obviously its not garbage since they have a legion of followers....
And KMK and ICP relationship started when ICP picked up Daddy X's band Humble Gods for a tour (I can't remember which one). When Daddy X, Johny, Saint, and D Loc put together KMK, ICP was going to sign them to Psychopathic Records, but they decided to do their own thing on the West Coast (since Pscyhopathic was established in the Mid West), and started Subnoize. ICP started taking them on all kinds of tours and doing songs together. ICP got Kottonmouths career kicked off (not saying they didn't do their own part), and you can see that in a lot of Kottonmouths early videos/songs. Basically they've spent a lot of time together (unlike ICP/Psychopathic and Tech).