I watched Jon Gruden and Brett do a show called QB Camp. I learned that Favre's reputation for "drawing stuff up in the dirt" doesn't convey his remarkable grasp of the game. He only adjusted plays in the huddle when he had seen a weakness or knew he could exploit a defender's tendencies. He taught his receivers to run short slants on every running play with an expectation that the ball would be coming if defenders grew tired of covering nothing and sold out on the faked handoff. For a guy that comes off as a bit slow, he has a savante-like memory for formations, routes, and play calls.
At this point, anyone still hating needs to just stop and go back to fully enjoying the Favre era.