Sold mine as soon as I got the true ending. ¯|_(ツ_|¯
Maybe if there was some variety in what was left to do, I would have kept it. But the sideops left and the barren open world left me with zero interest in continuining. There are very few games that deserve the label "perfect" in regard to any part of them, and MGSV certainly isn't one of them.
I guess it honestly depends on what you what from it and that's cool
Once I rinse the side ops and unlock everything etc I'm going to take a break and enjoy the xmas games coming out (and some Metal Gear Online) and then start on the PC version I have of MGSV as well, with loads more custom 80's music tracks