The main thing I liked about the franchise all that time ago when it started was the recreation of the cities. No other games let you explore Renaissance Italy or even 18th century Paris.
This was thrown out of the window over time. The story was always retarded historical fiction, but it didn't seep into the recreation of the world too much, which was kept somewhat historically accurate.
That began to go out the window with Syndicate, where the devs blatantly pushed their politics into it. You even work for Karl Marx in that, there is a troon side character, London street gangs have loads of female thugs, etc.
Origins, Odyssey and Valhalla began to completely fling any historical accuracy out the window, so I had no reason to play anymore.