Also, in MGS4 there is Big Boss camo (altough it should be named Solidus camo, because Big Boss lost right eye and Solidus left eye, so this is an outrage)
I cant decide on my fav one, if not for whining raiden in mgs 2 i would probably tie all the mgs games I played except for Portable Ops, it wasnt the best. I even liked Peace Walker even though controls sucked but i loved managing the Mother's Base and mgs3 was the most complex game but sometimes it was getting annoying changing the camo every 10 seconds.
But MGS V will have it all. Complexity, camo, mother's base and hopefully a good story.