The game does not actually force you to replay old missions. You just have to complete certain side missions to progress in lieu of them. That confused me as we

The game does not actually force you to replay old missions. You just have to complete certain side missions to progress in lieu of them. That confused me as well though - but I never had to complete any of those repeat missions and I completed the game. The game did not do a good job making that clear, however. I would not call MGS5 an unfinished mess. I would call it unfinished, but that fact doesn't detract from it as one of the most innovative games I have ever played. I have never had the opportunity to truly "be" a character in a game before. When you're playing every mission in MGS5 - you are Snake. You decide how every single objective is accomplished. Every mission can be played in a variety of varied ways. The fact that each mission felt so fluid and organic is a testament to the tremendous engineering and ingenuity that went into designing it. Oh, but how I pine for the final chapter that could have been!