It's true, Apocalypse World does require trusting the MC to run the game fairly and consistently. This "flaw" is also present in D&D, as well as pretty much every RPG where the DM/GM/MC/etc. gets a say in what happens next, so if that's a deal-breaker to you then your question is not "why do people like Apocalypse World" but "why do people like role-playing games," which is a fascinating question that I'd be happy to talk about, but it seems pretty off-topic for this thread.