I think when most people think of games this gen they think it's simply been an improvement in graphics without thinking about what some games are achieving beyond simply better "visuals".
For instance most games that utilise physics to any significant degree whilst still maintaining other complex factors (AI, complex animation, graphics, large number of characters on screen etc.). That would be the likes of Crysis, Lair, Gran Turismo 5, Forza3/4, Uncharted 2/3, God of War 3, Skyrim and even generic FPS' like the new Call of Duty games.
For specific examples, a number of levels in Uncharted 2/3 and God of War 3 are in complex motion whilst you play. The level in Uncharted 2 where the building is falling apart wouldn't have been possible with the sheer amount of animation, characters and real-time physics combined together.
Play the original Call of Duty and compare it to the current games and you'll realise you only ever see approx 10 allies and 10 enemies in a single map at any given time. In a few levels this was actually jarring from the action as all your allies might be dead and you end up waiting for the game to spawn more.
Lair (poor game that it was) featured numerous physics effects including real-time fluid simulations on the water that wouldn't have been possible last gen.
Skyrim tracks a ridiculously large number of objects in a huge sandbox world that eats up massive amounts of RAM that wasn't present in previous gen consoles.
Crysis acheived such a huge array of things on a technical level it's not even funny.
Even Gran Turismo and Forza, whilst similar to GT4 and Forza 2 have improved the driving physics to beyond what was possible last gen.
Furthermore, most motion control games probably couldn't be done unless there were specific peripherals for them. Even then, I think a lot of Wii and Kinect titles couldn't have been done last gen.
Lastly, networks infrastructure was poor last gen and a number of games probably wouldn't have been possible. Even the likes of Resistance 2 with its 60 player multiplayer, MAG with 256 players or even Left 4 Dead with all the innovative features it introduced.










