I don't value MGS4 too highly to begin with! Peace Walker is the most gameplay-centric game in the series, and I really get into that. The story, characters, and music are all ace, too. You can tell it was made for a portable, so certain aspects were sacrificed, but it's right there with the rest of them for me.
also, big boss as the lead always helps.
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"When I was a young man, I had liberty, but I did not see it. I had time, but I did not know it."