From what I've seen, I don't really get how this series is still big in the main stream. Not because it's bad, but because especially most things I got from 4 would seem like a pretty hard sell in the west (wth are these fanservice photo boss fights? Overly long cutscenes with a major character literally carrying a turd in his pants?).
I mostly play Japanese games, but Kojima's style is especially awkward, maybe because he's mixing anime shit with somewhat realistic art while blatantly ripping off hollywood movies. I guess I might even see it as a good thing that something different can still sell well, although I personally probably wouldn't be fond of these narratives. Kojima's apparent love for excrements isn't especially appealing, nor the awkward fan service and again mixture of random movie pieces and American history with shit like Raiden, that sticks out like a sore thumb.
If I liked stealth more, I might have still further checked it out though. Rising was cool, but that was at least full blown anime (and I still skipped many cutscenes). On the other hand, the horrid gameplay of ZoE2 also made me more hesitant of other Kojima gameplay.