The reviews have convinced me not to buy this game at full price.
No legit English game site has given it less than a 9/10, yet they all criticize the story, whether for the pacing or the amount of story. Sounds like the game is incomplete because of Kojima's falling out with Konami.
Apparently there are no longer any long codec conversations. And apparently Kiefer has almost no dialogue as Big Boss; one reviewer threw out a number like 50 lines? That's fucked up, there's no way Kojima originally intended it to be that way.
But the gameplay is supposed to make up for all that.