And that's the real problem. We all know who Snake is and how the world is manipulated... who cares, what we want is some tactical sneaking, getting scuba gear so we can get to that secret door we passed 8 hours ago, and finding a cardboard box to hide in.
Instead we have a game that is slowly melding into everything else like it. Long boring cut scenes, long boring walks around a boring base, and the only "tactics" are sneaking behind people to choke them. You've seen it in every military game starting from 2010 up.
Metal Gear used to be an adventure game where you collected gear to use at a later location. It was military Zelda. Now it's "objective-based" tasks... or military Assassin's Creed.. which is boring. If I wanted this, I'd play Splinter Cell.
I hope I'm wrong, and that the real game has more... game. Because this is boring and done better by other games.