He didn't win more than 9 games before Watson, and that was with Watt and Clowney in their primes, as a defense-focused team. Yeah, he got to the playoffs a couple times with that, but mainly cause the AFC South is a dumpster fire.
Watson has been carrying this team in spite of BoB these past few seasons.
His coaching decisions in short yardage, clock management, just general matchups (he never adjusts to shit) are all godawful. He's a bad coach.
Edit: Not to mention, Gase stayed with Miami for a similar amount of time, had 7 years of a mediocre Tannehill before he got fired. He's been coasting of doing well with Peyton for one year for like a decade. I don't even know what has qualified O'Brien for these 7 years.
And I know he wasn't GM, but he was part of the decision making process to give fucking BROCK OSWEILER SEVETY TWO MILLION DOLLARS.