I like Assassins Creed games. I thought Syndicate was fun (mostly). I didn't enjoy Unity so much, but it was also fun. I liked Origins, Odyssey and am enjoying Valhalla.
However, the Animus plot line feels like a forced attempt to make a link between the games. A link which I don't think they need. There are enough links between the games to imply a shared universe without this.
I like the wandering round finding missions. That said, playing Valhalla, I am finding the acting a little flat, and the story is less engaging than that in Odyssey.