I do think that the game caters better to some playstyles more than others. Personally, I'm a completionist in the way that I play games. I like to try and complete all aspects of a game, and I like to be rewarded by a sense of progression, which could be based upon improving a character's stats or their gear, but preferably by giving me story. What makes MGSV disappointing for me is not just that the game doesn't cater to my playstyle (completionism means suffering through hundreds of copy-paste Side Ops and praying to RNGesus to catch stupid fucking digital animals, and story? Well...), but that every other game in the Metal Gear series has catered to it. The more linear progression of the earlier games gave very regular story beats. Collectables and other side content gave you appreciable rewards. While the games changed in many significant ways between earlier releases, completionism was always rewarded...until MGSV, where it was punished behind in-game countdown grind, and progression was rendered context-lite by stunted exposition.
If you're the type that can play missions over and over without needing context for it, and if you kept to the Main Ops and only tried a handful of the Side Ops, I wholly understand how the game could be GOAT to you. I was blown away by the Main Ops as I played them first as well. But then I kept playing the game, and the aspects that made me view the game more positively were challenged by aspects that cast a negative shroud over the entire experience; the gameplay repetition, the shriveling and whimpering story payoff, and the grinding, grindy grind that grinds progression to halt.
If I stopped playing it twenty hours in, and my playstyle was the one in favour, I think I'd be sharing some of the positive feedback that some share in this thread. Unfortunately, I played the game as I play every game, and I was brutally punished for it.