Sons of Liberty
Everything was brilliant about that game.
I must say I haven't played MGS4 yet though.
I don't know, I still can't get over the fact that Raiden was the main character. Plus, I was disappointed by the story because it was too political. Not to mention that the boss fights in that game were a notch below MGS1,3, and 4 other than the fight with the 3 Metal Gears
Human contact, the final frontier.