This has indeed been a series, and this is Chapter Four!
The story continues as John has to deal with the consequences of the previous movies... which makes it just like the previous movies! This is very much the continuation, but the producers have to do a some more things to take it to the next level...
Which, on many levels, makes this a slog. This has never been the cheeriest of movies, but this just felt like "we are going to throw men after men into every scene" without any real sense of them needing to be there other than we need people to fill out the kill quota of fights. In one scene I was thinking "what is the point of this room (other than as a different place to have a fight)?" In another "whelp, this is a fight sequence we are having now."
Ultimately, I would like to watch all these in a series (although not in a theatre 'cos my bladder), as I didn't watch the others before this so only have vague memories, but... I can wait for that.
Oh, and this movie was decided the Lance Reddick. Yep. He will be missed.