I really want to play Mankind Divided right now, but I'm still trying to finish up MGS 5 completely.
You could say I've "beaten" the game but I've got 2 more of those repeating missions. I've put around 70 hours into this game and I have to say, I wasn't disappointed. If you're new to the series like I am, the ending (not a proper ending) was okay. Yes, there are some things that weren't explained but these surfaced to me only after I did some extensive reading about the lore.
I have no idea how Kojima was able to string up all these plot points together. Either he planned all this from the start or he made a lot of comprimises that actually make perfect sense. It's brilliant, IMO.
A certain plot twist in the game was astonishing for me even though there were hints about it in the very beginning.
About gameplay, I'd say it's definitely one of the best stealth action games to date. There are so many ways to do missions, so many equipment you could develop and use, lots of customization involved. The game was so much fun and it has made me interested in playing the older MGS titles now.