MGS4 wasn't exactly a game so much as it was an interactive movie featuring Hideo Kojima ranting against the military-industrial complex of the world. You paid $60 bucks to listen to him rant about it through the mouths of several characters.
Oh sure, there was a part where you actually played as Solid Snake in something akin to an actual video game with the stealth suit and the wide variety of weaponry. However the actual "game" part of the MGS4 video game seemed a mere afterthought compared to the massive amount of cutscenes that Kojima just had to put in. I don't disagree with his overall message, but if he wanted to rant that long about the military-industrial complex, he should just get a blog. It's cheaper, quicker, and it'll reach more people.