Two of the actors also deservedly made it to stardom. Robert de Niro plays a very unglamorous character, but his presence on screen is so intense that it's no wonder it made such an impression. As for Jodie Foster, she already appeared in films as a child, but playing a teenage prostitute was certainly not an easy challenge, and probably it was that role that really turned her into a major actress.
"Taxi Driver" was a big hit when it came out, both for the public and the critics. It won the Palme d'Or in Cannes, and served as a trend setter for many later films, like for instance Quentin Tarantino's and Abel Ferrara's. But even today, the original model seems difficult to emulate, probably because achieving a masterpiece is a rare thing, by definition.