First off, I don't think that starting him at an away game was the best decision, Plus, he got no help from the offensive line. On at least a couple of the interceptions he was hit as he was releasing the ball.
Peterman was clearly brought in because Taylor wasn't throwing the ball downfield. Consequently he overcompensated and should have the eaten the ball in a couple of cases where he tried to make plays.
I'll reserve judgment on Peterman until the Bills strengthen the offensive line.