Started the 3rd chapter. The last chapter started feeling a lot like Rainbow Six Vegas towards the end, until it ended with something completely not Vegas, but still cool. The shooting feels spot on, but some of the commands are janky. Like, when you're asked to assist the other player, it sometimes doesn't seem to register the first button press, which makes it feel a bit artificial. Other co-op aspects are transparent and really well executed, so that stands out.
Oh yeah, and does every damned game really need to have a minigun-wielding super-soldier?