That assumes we didn't win games we otherwise would have lost those seasons, which is obviously a bad assumption. People remember the close losses and blame the coach. They forget the close wins and credit the QB if you remind them.
Meanwhile, you look at the rosters and you don't see 10-6 talent. So why get mad you didn't get 10-6 results? Many of the people complaining the loudest about Garrett we're predicting worse before each season started, anyway.
I'll open the question up to everybody since Sydla apparently passed: how often have we seen a coach build, not inherit, a team capable of winning 12+ games in two out of three consecutive seasons and not have the HC be considered at least "good?" Much less have fans actually consider him a liability? Are there any examples out there?