At first I was really turned off by the gameplay because it felt like everything I liked Metal Gear for not being (a piss filter shooter-like game) and it felt like it tried to adjust itself to people who just bought the PS3 and didn't have any other game to play so they had to make a game anyone in that era could enjoy
And I feel like the gameplay is a disaster because I couldn't really enjoy it after Act 2 where I was having fun sniping everyone vs Act 5's ship part where I had to fight Gekkos

But as someone getting into the series and having played all the others I really liked the final game of the saga aspect of it, having all sorts of characters return was refreshing and seeing them full body with the new models felt strange at first but I really digged it afterwards, also the story honestly had its stones like the Snakehound shit that was just plot device and things like the absolute bitch that is Naomi but I was pretty much glued to the screen at many moments

All in all I still like the other three better but this one was good too