I give this game 4 stars. If there was an option, a 4.5.
The game itself is gorgeous, the graphics and the world. This is the first Metal Gear game(and possibly the last) that has an open world. And since the map is huge, the ways on how you infiltrate enemy bases and outposts are huge too. It makes your mind think flexibly on how you are going to play it out. I personally had a lot of fun just infiltrating enemy bases and taking everyone down, then Fulton Recovery them away.
The buddy system is unique, I had a great relationship to D-Dog and D-Horse(I haven't unlocked Quiet yet).
And having a base in the ocean that you have complete control of is amazing.
My only nitpick on this game is the story, its sometimes hard to keep track of the story as you are too busy doing work.
But overall, the game itself is a great piece of work by Kojima and KJP.