It is a general notion that Amitabh has acted in typical "Masala" movies only. But there is more to him than meets the eye. Here, he has taken on serious cinema.
This is one of his early films. He has given as terrific performance, which went unnoticed in the star-dust of his hit films. He did not return to serious cinema again. This side of him has not been exploited to the fullest. He has immense talent. That's why he continues to surprise us even after ruling the industry for more than 3 decades.
However, if he gives another shot to such films, he can leave an indelible mark. His best is yet to come.