I agree that it was the best of the three. I think it is a great Halloween movie but would have been better cementing that status if they moved the release to October. Probably a marketing oversight.

I think that a weakness was that the cast wasn't that star-studded. Michelle Yeoh and Tina Fey are the only two stars outside of Kenneth Brannagh. Jamie Dorman is a guy trying to be taken seriously after doing a more teen-appealling franchise but hasn't had the full conversion to serious actor yet that Robert Pattinson has. Kelly Reilly is an excellent supporting actor. Who the hell is Kyle Alllen?

So, yeah, we've gone from Murder on the Orient Express which had like a combined total of something like 25 Oscar nominations among the cast to this one.

I also think a strength is kind of figuring out the arc of the character. In the first one, the conclusion for Poirot was he decided that he didn't need to abide by his principles every time (punishing people who do wrong), in the second, he decided not to live alone, in the third, he decided that he can't detach himself from work (AKA retiring). I found that the most meaningful arc.