Play-tested it (single-player campaign). "Killzone: Shadow Fall" is a standard sci-fi military first-person shooter with linear gameplay, optional objectives, gory melee kills, fully regenerating health and fancy graphics. Meh, seen enough of that, actually.

I'll admit that the addition of the drone as a Buddy AI spices the combat up a bit. But it's still the same 'ol game as any other of its ilk. I'll play it (mostly for the PSN trophies) if you pass me the controller in a comfortable get-together, but I'd never buy it. Not even for $1.