This extra step helps to ensure that your child has the best possible experience. Sometimes this evaluation process can be formal, a club director of coaches can observe the practices and game day behaviors of the coach. This is the best evaluation process to have because it allows the league to see how the coach manages all the aspects of a team, not just games. Other times the evaluation may be informal, such as a survey of parents as to the experience they had that season. This method is less effective because it is second-person and sometimes may not be reliable.
Surveys are a good way to assess the overall quality of the program.
One of the best indicators of the success of a league is the percent of children who return to play the following year. Every league has players that do not return because the family moves or other extenuating circumstances. You should be concerned with the drop-out rate of players who did not want to return. This is an indication that the league is not serving its children very well. This is more important in the older age groups, but can also be critical if a 4 year old doesn't want to return to play as a 5 year old.