I love the first one.

Didn't like the second one that much.

The third wasn't amazing, but I did like it- some great performances especially Josh O'Connor; gorgeously shot. There was some good humor moments sprinkled throughout. I thought the "flock" characters were very problematic. A lot of tell, not show. The story wasn't well paced and fleshed out. But again, didn't think it was terrible.

I really liked it. Loved Josh O'Connor's performance, and the lighting/cinematography was terrific. I agree that the secondary characters were not as developed as I would like, they really wasted Andrew Scott. And there were some wobbly plot points, but still loved the locked room mystery aspect. I am a sucker for these Agatha Christie-inspired movies with large casts, I will watch them all.