It's not the "2 hour gameplay" that's the issue. You brought up the "cutscene heavy" aspect. If Kojima wants to make movies, then he should do so, instead of putzing around. Square Enix falls into the same category in the wrong direction. They were battle heavy, but their emphasis was solely on, "hey let's tell a story with some ****** gameplay tacked on top." It was a 6-hour miniseries lumped into a 60 hour game. I'll say that's even worse than Sons of Liberty, since more time is wasted. Most games at least offer a middle ground. The original and Snake Eater were the series' best entries at finding a sweet spot.
What would be better is taking the Arkham Asylum approach of less cutscenes with the story being played out while you are actually doing things, instead of "play, stop to watch, repeat."
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"Should I slice off your tongue or break your countless bones? Either way, I get paid; you'll bleed to death and die alone." - Blood Money