Played the beginning of MGSV and it was absolutely amazing. The graphics, gameplay, story, etc. are great. Great way to start a game with a supernatural invincible fiery guy that rides a flaming Pegasus, a giant fiery whale, a floating kid with a gas mask that can use the force. I was a couple minutes into the game and I had an "oh
sh!t" feeling almost every corner i passed. Unfortunately I don't understand most of the story right now because I haven't played the other Metal Gear games.
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You can tell MGSV was a labor of love for Kojima - the amount of content in that game is absolutely amazing. If you do not have the backstory (or any of the story) then you should get an overview somewhere to really grasp what is happening. The overall story for MG is dense, and if you are coming in fresh it will be easy to get lost. Plus the ending will not hit youthe same as if you were someone following the titles since at least MGS3.