The problem with PA films
Like a lot of people I liked the first one, and the others are ok for a cheap thrill if you're bored in the evenings.
Obviously the films are massively profitable, but I think they fail on a storytelling perspective because, quite frankly, 30 minutes after the end of each movie I completely forget the names and faces of the characters. So any story arc over the last 10 years is pretty much impossible to follow. I think the main reasons are:
#1 The films aren't really re-watchable. So they aren't going to be imprinted on your memory.
#2 Unknown actors. Every time a character from a previous film is shown I have no clue who it was because I forgot their face. And when their names are referenced I have no recollection because of #1
These points may not be avoidable, especially #2 because of the low budget.
Unless your a guy who loved the franchise so much you watch the films multiple times... or you have an eidetic memory... in the intervening years between films most people are going to forget character names, faces of unknown actors and small plot details. So the long story arc is delivered in these confusing little fragments that aren't possible to piece together unless you watch the whole series back to back. And I think very few people will be willing to do that.