Amitabh's acting in Piku has won my heart. So natural! Fantabulous Irfan Khan. But, he is second. I have not seen any other films of Nawajuddin. So I can't comment. What about dipika? She is also very natural.
Sad to see AB continuing to toil away at this age, to break bread for his household. With son turning out to be a dud, wife still recovering from political isolation, and DIL still not fully back in the earning, AB saab does not get time to rest well at this age. Perhaps, his die-hard fans are lucky !