Without even having to see it I would consider Rocky and Bullwinkle his worst.

Just watched A Bronx Tale for the umpteenth time today and it's far from being DeNiro's worst. Its a fantastic film where he puts on a great performance. Not the best of all time, but noteworthy to say the least.

By worst and best roles do you mean the actual film or his role in the film to be either good or bad?