I could go into a spiel about what I find less than optimal about PbtA, but I won't. At the end of the day, the big "problem" I see with and hear about PbtA is that the main mechanic relies on trusting your MC to know how to make Failing Forward work, to generate complications which are relevant and at least consistent with the situation if not necessarily balanced.

Which is to say that if you're climbing over a wall, and roll a 1, "you land on a bear" is technically a valid response from the MC. And without broader lists of potential complications for such rolls, and an explicit directive to the MC to make things shitty for the player characters, that's a hell of a lot of faith to put into the guy running the game, especially in a hobby where the idea of an antagonism between MC and players is still clinging on from it's modern originator. I know one person who I've played with that I would maybe trust to not kill all the players an hour into the first session, whether through malice or incompetence.

So I'm just wondering what people see about PbtA games, and especially AW, that makes them like it so much.