I don't know where I would rank this one, but pretty far behind Rogue One I think, which seems like the best comparison being the only other standalone film to date. I didn't dislike it, but i didn't feel like it exceeded my expectations in any way, which were pretty measured going in.
I think in retrospect, there were probably too many previews because I felt like I had seen most of the movie already played out in snippets, aside from a few surprises. I thought the cast was fine, there were a couple of plot points that felt weak or a little forced, but nothing too glaring.
Well, except for THAT scene. W T F?!? I don't even know where to start with that one. It was a jarring moment that really took me out of the rest of the movie I felt like. I have a hard time wrapping my head around the reasoning behind it.
If there was a letter between B and C that would be my grade I think. I don't feel a strong desire to see this again, though I'm sure I will.