One of the main problems many reviews seem to be coming up with for The Last of Us is a problem similar to what Jeff had with Bioshock Infinite. That sometimes your AI buddy isn't in as much danger from the enemies as you are.
A lot of reviews seem to point out that when in stealth sequences, Ellie could have path finding problems and take a weird detour around an object to remain with you, in plain view of the enemies. While you might have a point in saying that the pathfinding is off, I think it's weird saying that the game not punishing you for something that you didn't cause to happen is a negative.
It seems to me that it would be much more frustrating if you was successfully stealthing (a real word I'm sure) past a set of enemies and be forced into a combat sequence by the AI. Also, why do you want the AI to be in as much danger as you are? Do you want me to remind you how much everyone hates escort missions?
Small thing to be upset about, I guess.