Really unpopular opinion: I think they should have only made the first movie. As a standalone action flick, it is terrific.

It was much better when the world was mysterious, and I find I have lost interest in the world as they try to build it.

I barely even remember the third film. When I see clips I remember them, but I struggle to remember the actual narrative.

I haven't seen the fourth, and have no plans to do so, but I wouldn't go out of my way to avoid watching it.