Differentiate between "good" and "bad" acting?

 differentiate between "good" and "bad" acting?

Rocky Handsome

There was a scene in Rocky Handsome where John Abraham was coming out from hospital and started looking at his pregnant wife .He was happy at that moment

His wife was inside car and looked at him back with smiling face

And after a moment he received one call and his facial expression changed

And very next moment one truck came from somewhere and hit his car

And now he was completely shocked he did not have any idea what just happened to him

And he become completely numb at that particular moment

And then some bullet hit him and he fell down on ground

And very next moment he realised everything

Now just see the expression at the moment of time when he had everything to nothing . In just few minutes he lost everything

And

And lets take one more example

Awarapan

In that movie, Emran was completely broken from inside but nobody knows about it but one girl reminds his past and very next moment he find himself lost in memories of his past

Just see how broken people look alike

And In past where his lover lost her life in his arms just see the way he hugged her

And after that he tried to kill himself, failed and he unable to tolerate the pain of her death so he went inside and started digging

And another one

Just see the madness on his face

That acting was highly under rated

Now Dabangg 3

Almost similar scene in Salman Khan movie where bhai is trying to save his girlfriend

Is that red chilli sauce and suddenly bhai started running to save his girlfriend

Bhai facial expression are painful

And I didn't understand bhai is laughing or crying

His girlfriend was going down and down and down

Again I am confused bhai is crying or just happy because now sonakshi will come

Keep smiling :}

Picture Source Wikipedia