I watched this one Friday night. It was very enjoyable. I love the character Poirot. I'm not much of a fan of mysteries, but this series has been a lot of fun to watch, I hope they do make more movies, I'll certainly watch them. I think it does make a big difference, when you can tell the actors are having fun in their roles, and Branagh certainly is.Watched Death on the Nile. I thought it was enjoyable, with a dazzling cast set against equally dazzling scenery. Of course, due to the restrictions of timing/budget, a good portion of that scenery was CGI, but not distractingly so.
As I understand it, the plot deviates from the novel by condensing characters and changing some details, but I thought it was sufficiently twisty enough to be enjoyable. As best I can tell, Branagh has a blast playing Poirot, so I'm certain there will be at least one more in this series, to make a trilogy. But I wouldn't be surprised if it went beyond that, too, as there's plenty of source material.