At the risk of stating the obvious :
- Agatha Christie's classic whodunit original is a masterpiece in its genre, albeit a literary lightweight and very entertaining one.
- Theatricality has been a Branagh trademark ever since 'Dead Again'. Though his financial and technological means have evolved, his basic patterns have not.
And so I suspect I didn't enjoy this as much as I could / should / would have, partly because I don't really fancy the Branagh approach and partly because I knew the plot much too well.
I hope you won't let that prevent you from going.