I watched the season finale, too. It was satisfying, it did a few things I didn't expect, and a few things I don't necessarily like, but overall I was happy with the result.
Legion as a whole was pretty wonderful show. It is strange and weird, in a very entertaining way that keeps me wanting for more. It feels like an enriching experience, something you might not want every show to be, but you definitely don't want to miss having experienced. (Kinda the O.A. was for me, too, even if that is on many other levels very different)