From PC gamer of all places...
http://www.pcgamer.com/review/bioshock-infinite-review/2/
The final new element in Infinite’s fights relates to Elizabeth, the woman you’re here for. She can open ‘tears’ in space that lead to alternate universes. In combat, those universes seem to be full of heavy weapons, medkits, and turrets that are mysteriously on your side. She can only do it at predefined points: you see a ghostly image of the various things she can bring in at different spots, and you press ‘use’ on one to order her to make it real.
If this isn’t sounding contrived yet, I’m not explaining it properly. These tears are the very heavy hand of the level designer offering you a menu of choices, and they often make the fights feel staged. You can only open one at a time, but that decision is almost always an easy call: of course you want the turret. When you need health, opening the medkit tear is just one more press of the ‘use’ key, then you can bring the turret back. These things might as well be part of the level.
Elizabeth herself is nice. I liked her. If you were hoping for something more – perhaps even the fabled Strong Female Character™ – you might be disappointed.
When you’re together, she’s relegated to the role of caddy, limited to passing you a new weapon when you run out of ammo, and only ever using her own abilities when you command her to.
And when you’re separated, the plot repeatedly underscores how helpless she is without you. Again, this is not unusual in videogames, it’s just that the sublime introduction to Infinite’s story led you to expect more from it.
You do have a handful of really lovely character moments with her. But the few times that she does something of her own free will, the significance of the act is undermined by the plot’s broken logic, and so is the chance of building a more interesting relationship.
The worst culprit is the ending. The plot’s final emotional sting is an action that just doesn’t seem like it would achieve anything. It seems to be assuming some new rule about how this world works – but since those rules were never established, any drama that hinges on them feels arbitrary.
That completely deflates the ending’s potentially enormous impact. And not just for me: two other reviewers and I discussed it at length, trying to come up with a compelling version of the logic, and none of us could find one.