There will always be Agatha Christie adaptations and faux-Christie movies. You know if you like them, and if you do, you know to watch each new permutation. You will never be surprised, but Agatha Christie is like comfort food for fans. If you are a fan, you will enjoy A Haunting in Venice.
One of the ways producers make the latest Christie movie seem different is by filling the cast with a new set of big names. The cast in the first in the Kenneth Branagh series featuring Hercule Poirot, Murder on the Orient Express, included Michelle Pfeiffer, Johnny Depp, Willem Dafoe, Judi Dench, Derek Jacobi, Daisy Ridley, Penélope Cruz, Olivia Colman ... you get the idea. I didn't recognize as many names in this third installment, but Michelle Yeoh goes a long way for me, and Tina Fey pulls off a rare dramatic role. There are suggestions of supernatural occurrences, which I guess is a little bit of a change for Poirot. But for the most part, A Haunting in Venice is more of the same. As my wife, who chose the movie, said, "It was fine. Nothing too exciting."
It's not a waste of time, and it comes in at a pleasing 104 minutes. But if you ask me, stick with the Knives Out movies.