When will people stop [bagging on Peat]

There was one sack, which was on Kamara (or else on Easton and McCoy which seems less likely). Peat gave up a pressure in the second half when both ILB's crossed on a blitz. He also missed a block which lead to a TFL on Kamara.

Other than that, having watched the whole game again looking at Peat every offensive play, he was very good and made 3-4 key blocks leading to TD's or big plays.
If we are talking about the same play in your first paragraph that wasn't on Peat. Peat had already blocked two guys and the second one held him to keep him from getting to the delayed blitz. It was actually a phenomenal effort. On the tackle for a loss he had no chance to get to the edge when three bucs were over there and we pitched the ball into the strength of the D. I rewatched every single snap.

In the first half he did whiff on a block which I assume was miscommunication.