Uncharted 4 is not GOTY, but out of the nominees it definitely was. That said I'm glad Nolan and the narrative were recognize. Fan criticisms about the story are flat out wrong.
I thought overwatch won because of its staying power and presence on the e-sports scene. It's just as popular, if not, 'more so than when it released. UC4 was a great game with great scores. But sometimes it's more than that.