Well, last generation didn't have such great online play as the current one, community (interaction with friends while playing), online co-op, rankings, achievements. Current tech allows for a better cinematic flow for many games, you could chalk it up to raw power (graphics) but it definitely adds to the gameplay something more than just "make it look pretty". Next-gen also helps improve on physics, better AI, better framerate, better draw-distance. There are tons of things going on many of today's games that are not simply a result of "more polys, HDR, HD textures, better particle effects".







