Battlefield 3 (1366x768)
In Battlefield 3 in 1366x768 resolution and Low settings, Iris Pro Graphics 5200 achieves 55 fps. That is definitely playable, and better than a GeForce GT 650M. The fastest integrated Intel graphics from the previous generation didn't get more than 20 fps, so the improvement is very impressive.
With the High preset, Iris Pro Graphics 5200 get 33 fps, comparable to the GeForce GT 650M.