None of the MGS games are truly shite. But yeah MGS 4 was certainly the one where I felt Kojima took things too far. Too pretentious, too self-indulgent. MGS 2 had a little bit of that but not nearly as bad as 4. It would've happened with 5 as well, but clearly someone at Konami had enough of his shit (though that doesn't mean I like Konami, they're awful). Now he has free rein, it definitely seems to be happening again, and probably far worse than ever before.
I guess it's an interesting experiment to have a completely unleashed Kojima do whatever he wants, but I suspect it will result in a game that's all over the place with a completely incoherent mess of a story. Or it might turn out to be a great game anyway, we'll see.