GTA V - Nvidia better
COD - Same.
Wicher 3 - Gameworks. Not sure what patch this is running on as well, later patches increase performance a lot. - Nvidia slightly better, even most of the time though.
Assassins Creed - There it's pretty much even, Unity is crap generally, so not really indicative.
Far Cry - AMD card better, though quite even.
Shadow of Mordor - AMD card better, though quite even
Ryse - one random drop on the i3 (bug?) else AMD better.
Crysis 3 - Gameworks again. (EDIT: Nvidia better, obviously.
Remember Crysis 2? Page 2 is lovely.)
BF4 - Nvidia better.
I'd also like to know what the resolution is that he's running these tests at. I assume 1080p due to him saying console level performance?
Currently those two cards, the 750Ti and 360 are quite even, I am just advising the 360 to be more "future proof".