I played the first two, and enjoyed them quite a bit, but I can't really remember anything specific about them. Then the COD phenomenon happened, and I gravitated to them just because that's where most of my friends were playing online. In the end, there's only so many military-style FPS games the average gamer will want to play in any given year.
So Killzone should find some way to differentiate itself from the generic pack. God knows how. I read good things about Killzone Shadow Fall though...worth picking up?







