Hm... 8/10
I haven't read any reviews, but I'm guessing that people who score this an 8, just want regular games, not the weird Kojima ones.
A mate told me about a cutscene that over one and a half hour long (I punched him for spoiling, btw), so I'm guessing there are gamers that are just not into that stuff.
Not that I want ALL my games to be as weird as MGS, but that's what I like about this series, it's unique.
In the end, I don't agree or disagree with ANY of the reviews. That's something you can only do after you've finished it.