Sekiro: Shadows Die Twice is a beautifully crafted game. The combination of excellent story-telling and world-building, gorgeous visuals and sound design along with an outstanding combat system will make it one of 2019's best games. The one aspect that keeps it from being a must-play for everyone is the sheer level of difficulty that some players will find off-putting.
If the first Division never did it for you then the sequel is unlikely to win you over. This is a sequel with a small 's', refined rather than revolutionary, squarely aimed at fans of the first game who are eager for more.
It's going to be grindy, there will be so much loot that you won't know what to do with it, and I personally find the story a little hard to get immersed in. However, the combat is great and the mechanics work well together, there is a huge world to explore and for people who love the genre, this will be one they don't want to miss.
The game is a real step forward for the series, adding new elements and refining the already good combat system into something really quite special. There is something here for fans of fighting games, and UFC fans alike.