I have to say it has to be SF 4. I mean, come on man this is street fighter that we're talking about. The classic and the awesomeness cannot be expressed with just words.
killzone 2 isnt really that good i dun think, very overated. Graphics are good but i just don't like the setting and the controls. ive played both sf4 and resi 5 and i think sf4 is better cos its fun for multiplayer and theres also alot of stuffs to do like the challeges. not too keen on the resi 5 controls either, the cursor moves really slowly when you're aiming!!!
definitely street fighter, I just got it today! totally brings back memories, it so like the arcade style that I used to play with!!!
SF4 if u got a Ps3, if u get it for M$ then make sure u got a stick or a converter that lets you use PS pads on your 360
