I think the frustration, from yesterday, is that Lamar's three critical mistakes were pretty much 100% on him. I'm not blaming play calling for two horrible INTs and a pocket fumble. Technically he put the ball on the ground at least 3 times yesterday... its just the other two were either recovered or didn't matter.
Play calling hasn't been great, the running game hasn't been great, the Oline wasn't great. But yesterday, I thought the latter two were easily good enough to win that game. What wasn't good enough to win the game was the QB.
That's one game. They didn't lose to the Chiefs because Lamar was terrible, and we didn't lose to the Titans because Lamar was terrible. I think we pretty much entirely lose yesterday because Lamar was terrible.
Again, that's just one game. Not every win or loss has to be all encompassing of all other games.