Problem is, he's not gunslinging, he's gun-shy. Favre was throwing the ball all over the place, just making bad decisions. RG3 is jumpy in the pocket, is absorbing a lot of hits and is more worried about where the next one is coming from than anything else. A QB's confidence can also be destroyed by taking too much of a beating.
He reminds me more of Finley coming back after his injury than anything else. He's hearing footsteps out there.