After reading up on Roiland and his past ventures. I'd be hesitant to say it was his writing that made the show. I'll have to catch up on R&M to really know. But I really don't feel like that dude is packing literary nukes in his pocket. Harmon was the one originally approached for R&M, Roiland has like Acceptable.tv as one of his only writing gigs besides R&M. I think the bulk of the talent came from elsewhere he is mostly a voice actor.