To me it has to be Peace walker. MGS2 was a cake walk I finish that on euro extreme and found that game fun. All the console games I loved. MGS3 was kinda hard with the camo index on hard mode but fun still Peace walker was a mind ****. If you dont have all the items unlocked and levels maxed out you get chopped by the tanks and hind. I hate it because there are so many enemies in that map just to get passed before you take on the tank or hind. Doing that on hard mode trying to tranq the enemies etc to get S rank is a mission and a half.
"Why do you hesitate to extend the power of Macedon - your power"-Alexander The Great