Replayability doesn't help when the story is garbage. Does it have better combat? that's actually something I argue about. There are subtle things it took out from previous games that to me just make no sense. For example, you have to take out a relay box to prevent enemies from swarming the place your working through, yet if there is one enemy left, and you shoot the walkie talkie he's carrying with a silencer, somehow every enemy in a 20 mile radius is alerted of your location.
I also didn't like the boss fights. I thought that was a cop out. Just like the missions in the game, bosses had to be fought multiple times. Compared to the previous games where for the most part each boss was fought once, and if a boss was fought a second time, it felt very different than the previous time.
When I got the game, I had hoped it would have big condensed areas like Ground Zeroes had. A military base where you had to stealth your way through, maybe a small city to abduct an enemy leader. While it was explored during the Africa area of the game, Afghanistan was just sand on sand on sand on sand. It didn't need to be Assassins Creed Afghanistan, but at least have something other than the same cave and outposts reposted every 10 miles.
Every time on that damned helicopter just felt like one big middle finger from Kojima to Konami.
Yeah, that's my 5 rant. Honestly, there were just better games during the time I grabbed the game. Dishonored had just came out, and even Black Flag did the open world thing a bit better than MGS5 did.
Having no story at all makes it vastly superior to the trash MGS4 was. God thats whe worst fucking garbage ive ever seen in any medium for a conclusion to a story.