Couldn't disagree more with the OP.
When it launched in 2014, Metal Gear Solid V: Ground Zeroes was an amazing prologue. Despite only being contained to a single base, the multiple extra missions beyond the story one and the many different ways to approach things made it a sandbox that I played in for a month happily. It was an experience that had me hyped for when the true game would come.
Over a year later, Metal Gear Solid V: The Phantom Pain finally arrived. When playing through the opening hospital sequence, I felt some of that hype. It was tense and exciting and I was looking forward to what a real next-gen Metal Gear experience could be.
Not long afterward, the game opened up into its true form. And I was appalled. A barren, lifeless open world that constantly sends you to the same locations to deal with the same enemies. A story that felt way off the mark even by weird MG standards. Vocal changes for major characters that were wholly unwelcome. A terribly tedious amount of base and personnel maintenance. So many things about the game felt out of place in a MGS title. After putting 40 hours into it and getting much of the way through the first act, I'd had enough.
I realized that I was decidedly not having fun. And that most of the time I'd been playing I was in denial that a Metal Gear game could be so awful. I faced up to the fact that I absolutely hated this game with every fiber of my being, uninstalled it, and never looked back. To this day I could not care less what happened in the story, to the point that I couldn't even be bothered to go online and find out. I felt completely betrayed by the franchise as a whole.
Metal Gear Solid V: The Phantom Pain is an absolutely terrible, frustrating, boring, repetitive, awful game that I do not wish on anyone. When someone expresses that they miss this game, I can't help but wonder if they also miss Online Passes and on-disc DLC. I accept that there are different strokes for different folks, but missing the worst thing to happen to mainline MGS just leaves me scratching my head. MGSV is a game absolutely best forgotten by time, as a bad dream that never happened. I might be willing to embrace it one day if a different team decided to remake it. But all it did was convince me that I was done with Kojima as a game director. While I am fully aware of the problems between Konami and Kojima and I am in no way championing Konami over him, so much of the core design of MGSV is just flat out wrong and bad that I absolutely cannot trust his judgement anymore.