killzone 2

killzone 2 is one, maybe the best fps' ive ever played, its developed by guerrilla games, a company based in the netherlands, its also a subsidary of sony computer entertainment, which explains why its a ps3 exclusive.

alpha team 

the game continues on from the first killzone/killzone liberation (a psp market entry). The isa have taken the fight to the helghast and invaded their home planet of helghan, you are part of an elite team named alpha team, tasked with capturing the helghast leader scholar visari, you fight your way through the ruined city of phyrrus and other locations, unravelling the mysteries of the helghast war machine and a bit of culture as well. The game has a fair amount of interactivity such as driving a tank and operating an AA gun onboard an isa cruiser as well as making use of the ps3 controllers sixaxis capabilities.

I think its such a good game because its a massive step up from the first killzone, i think its got fantastic graphics and effects, the AI is fantastic with all of its various movements and actions it makes on its respective difficulty levels. All of this combine with its great storying and methods of telling it as well as the interactivity.