I understand that there are elderly and disabled folks, who through no fault of their own can't maintain (nor afford to pay others to maintain) their yards and parkways -- so they get a pass. What is troublesome are homes that have changed hands within the past few years that are either owner-occupied, or that are owned by out-of-the-area investors, where the lawns/parkways get little to no attention. Even a dirt parkway is better than a parkway covered with the tall weeds of neglect.
Pro-tip: Landlords, if your tenants ask that you knock $75/month off of the rent and they'll maintain the yard -- guess what --- they won't (in many cases). Chapman University parents who own houses in the neighborhood -- if your son or daughter tell you that they'll take care of the yard -- they won't (again, in most cases). If you can afford to send your child to Chapman, and purchase a house for them while they attend school, then I suspect that you can afford to hire a lawn maintenance service to help keep our neighborhood looking sharp. Likewise, if you are an investor who recently purchased a property as an investment to rent to either traditional tenants or Chapman University students, please have your yard/parkway professionally maintained such that we can maintain our beautiful little oasis here in Southern California! A little bit of effort makes a big difference!