There is definitely more than one thing I find absolutely amazing about this game!
So even though I have to choose 1 aspect of it- well we all loved it all (I think I can speak for all of us in this thread?

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Okay so besides graphics, gameplay and story I think the coolest thing for me was the edition of the photo mode with all the beautiful filters that accompany it.
my reasoning behind this is that:
the graphics are amazing- everyone expected that
the story and writing is tighter than ariana grande in a leather pants- everyone expected that
the gameplay is superb- also expected
I could go on but I think I've driven my point to libertalia!
the photo mode however is something nobody expected or even asked for- and yet this simple feature lets you share the magic and beauty of the game with everyone you would love to experience it!
what a better way to show off your experience as Nathan Drake mid air punch while there are a countless particles floating around the background from an RPG that just ripped passed you colliding with a bag of sand behind you.....and then it looks even cooler cell shaded
It is an excellent edition to show off not only your photography skill and quick eye for a great pic but also a praise to the level of attention to detail that Naughty Dog puts into their games and breaths into their created environments!
EPIC
and that is why i think it is the coolest feature in uncharted 4