^ oh holy shit so that's the song they're all "hahh ahh, ahh hahh"ing at the end.
i have no damn clue, maybe it was made up just for the game.
for me the series goes: 4, 1, 2, 3.
at first 4 and 1 were tied, but after getting the entire story into my head without any confusion its the best. but the entire series was just classic after classic, Metal Gear 2 is up their with MGS1 for me.
that corpse camo was nice to get though, because i just finished the no kill/no alert playthrough and you just have to play like shit to get it.