Is mostly the AI support is illusion breaking... Which is kind of hard to get right in the first place.
ND's choice to have a campanion along the way I think was a big call, because it can ultimatley break the emmersion of realism. It's a great idea but with that comes problem with a game that has stealth elements within it.
If an AI partner was to run past a clicker causing it to pick up your presence, this could have become a massive problem. But it seems like they don't alert the infected ? (From what I've seen).
And this is the only downfall of most positive reviews, could they have done it better, is it fine the way it is, should they have introduced a partner your with most of the game ?
I don't know.
If that's the only negative thing that most reviewers have to say, then I say job well done to Naughty Dog.
Honestly, Eliie walking in front of a clicker isn't going to bother me.
And if the AI partners were attacked more by the infected and hostile humans, then people would complain that they keep getting in the way and that would be too much of an escort mission. There's always something to complain about. I'd rather have them be "invisible" to the enemies rather than always getting killed by them, which would make the game really tedious. Especially on hard and survivor mode.
Bioshock nailed Elizabeth.
During the demo on one playthrough I did on it, Ellie yelled "Help!" when Tess and i climbed over the blockade to the staircase. The clicker didn't do anything, though. But in the case of a game where the whole thing is an escort mission I would rather have partners that aren't easily seen by enemies. Only in certain scenarios where I run off without them and an enemy grabs them, giving me time to get back and get the enemy off of them.