The good ones have minimal hype, support informed consumer choices and give a preview of how they conduct business.
Sites with updated information for current players about practice plans and travel schedules reflect well on the organization's ability to organize and communicate.
Sites with rosters for each squad at each age group give a clear idea of the level of internal competition they foster and give a context for evaluating the alumni/commitment/draft sections.
Sites with contact information and bios for the coaches of their squads let parents know the kind of qualifications and networks their coaches bring to the field.
Like everything else, read with discernment.