I think they've been great. Set themes, published example scripts (including one that was annotated), asked writers for rewrites instead of rewriting themselves or throwing strong ideas away, said online when they would contact us and have followed that so far. What more can you expect from a show that gets 15000 sketches?
Given the volume of material (and that they will have to do some editing to 'successful' rewrites), I'd be very surprised if they had worked out all the shows already. I doubt that always happens for shows with 'only' a couple of hundred sketches to choose from. Backing that up, I've had a "no" for a rewrite for one episode but have yet to hear on another.