No proper ending, cut content. Conclusion was just plain bad and ruins the whole series imo. Repeated missions. Bad character design, old Native American guy c'mon. Bad story,vocal parasites Jesus Christ...Predictable story. Gameplay although pretty amazing got repetitive after so long.
To me I don't consider this a true MGS title. 1,2,3,4 are but the Big Boss storyline is just hot p*ss
Regardless of whether the game was finished or not. The games story was just terrible. Codetalker the native American. The vocal cord parasites. Snake not even snake. It was trying to do too much at once. It was all over the place. And the ending was disappointing and misleading. Not a true mgs game in my opinion. Even if it was made by Kojima. You could tell he was getting sick of making the series and tried to drag it away from its roots.
I had a massive headache just trying to get it working correctly to begin with. The speed tied to the framerate thing, stuck at terminals glitch, out of sync speech. Ridiculous a new game can't run properly above 60fps. Had to enable vsync to play it on my gsync 144hz monitor.