Although he served as the PM for merely 11 months, he left quite an indelible mark. He thwarted efforts of Pakistan to start war with India.
He visited the Golden Temple to ask forgiveness for Operation Blue Star. His appeal played a role in calming down the rebellion in Punjab in a couple of months.
He took the initiative to implement the recommendations of the Mandal Commission. This Commission suggested a fixed quota in the public sector for OBC. V P Singh was criticized by the upper class but he won the hearts of OBC.
He is one of those people who tried to bring about balance in the society through removal of castes.