Hardly one of the worst.
That Peterman game gets a lot of attention because of the INTs, of course, but the defense that day was historically bad. They weren't beating anyone with or without Tyrod. If you want to give McDermott the blame for fielding a defense that smelled like ass, then do so, but thinking that we would have won had Tyrod started is delusional considering how bad that defense was.
I'm more pissed about the Jets game than I am the Chargers game.