Except we are sitting at 16th on defensive 3rd down % this season, 2nd best in the league over the last 3, and 7th last season. Criticism of McDermott is valid, but commentary like yours that is so far from reality makes it hard for anyone to have a serious conversation. This is far from "anything they want on every 3rd down".
McDermott is widely viewed (and backed by data) as one of the best overall defensive coaches in the game. It is well worth having a conversation about his situational play calling or game management, but you have to do it in the context of some pretty successful football.