This only my views after watching the movie, and I am not going to reveal the story/plot in detail.
Aamir has done full justice to the role. He has always been doing that in all his movies. one of the talented perfectionist. I am not so sure about the script / direction - obviously one will feel it is not upto Aamir’s standards, I felt. You may have some questions on many things - for one, rich business men never had someone in his office to help him wearing the blazer. Or all his business managers, personal assistants vanish in later part of the plot. so on and on.
But Aamirs performance is brilliant and spectatoror will fell like adding power to his punch when he chases the villain. Hero wins the audience support because of his helplessness due to the disease - anterograde amnesia.
So were the other parts - his romantic stints. May be a bit of overdose of violence for kids. Otherwise you can watch it with family.
I did not watch the original Hollywood version - Memento, nor the Tamil version.:(
Certainly recommend this one.