It's exactly as I feared.
Some people are so heavily influenced by modern passive media (TV, movies, music) that they expect video games to convey the same types of stories.
It's okay for a game to have a long story, and it's okay for that story to be full of japanese cultural convention (mechs, deus ex machina and the like). However, it is NOT okay for people to say that video games like this are the pinnacle of the medium, because then the point behind it all, interactivity, is lost. Video games represent an exciting new way to tell stories, but MGS4 doesn't really tap into that potential. At the end of the day, it's similar to a JRPG in that it's story -> gameplay -> story -> gameplay -> end.
The gameplay and cutscenes merge together beautifully in MGS4, so I'm not knocking on its presentation. Rather, I'm asking why there are cutscenes at all. They are passive. They are skippable story bits that don't enhance the gameplay, they only enhance each other. When a person says "The story made the game great for me.", what they're really saying is "That was a good book."
MGS4 is a good action game, and it's utterly beautiful. However, everthing in it has been done. Not this beautifully, but its been done.
Some of us want games to keep getting better. MGS4 does nothing for us.