I belive Gears of War 2.
Action - Gears 2 had tons of action into it.
Storyline - Anything that was done in the campaign, was understandable, you could understand why they did what they did yet it brought suspense when needed.
Characters - You see many familiar faces plus some new ones, I only do not like the fact that B. Carmine dies too.
Gameplay - The controls are easy to use and understand yet and the game play makes you feel as if your in the game.
Enemies - The enemies seem some what smarter, yet they are still dumb, they are also smarter so they use more tactics and on higher difficulties give you more of a challenge.
Music - the music goes great with the game, it really brings out what the game is about.
Graphics - the game has amazing graphics, even on a bad quality tv, the game still looks nice.
Ending - the ending was very fun to play and very interesting, it made alot of sense and it felt good playing it.
Overall - I think gears 2 campaign was great and even the multiplayer is fun. I think Gears 2 is amazing. Epic Games did a very good job.