Tom Brady came close to Tebow's debut performance in the first game he started back in 2001 against Indy.
Cam Newton.
I’d say 90% of the rookie QBs have had better starts. His last 5 minutes of regulation were really good, the 55 minutes before that he stunk. He was 4-14 for 40 yards 55 minutes into the game. The only real positive he had in the first 55 minutes was no turn overs, he missed a lot of open receivers but always missed them to grass.