In everyday life, one often observers others behaviors which enable one to perform the same desired behaviors. Observational learning normally first occurs when one is a child. Children often observe the behaviors of their parents or caregivers and other children. As one develops observational learning is used in learning how to eat with utensils, how to dress oneself, how to drive, and sometimes how to interact with others. Many aspects of everyday life are learned and relearned through observational learning to help with one's development.
I do believe that observational learning is effective. Observational learning is used as a tool for both learning and teaching. Some learned behaviors are positive and some are negative, overall I believe that positive learned behaviors outweigh the negative behaviors. Therefore, yes I do believe observational learning is effective.