People who know this place better are divided in their appreciations of the delegation. I personally have found that the Delegation is slightly over-rated but still is worth pay a visit to the historic center. I recommend doing so at night when the small-town, pre-columbian atmosphere is stronger. The variety of restaurants and public events going on is something to appreciate. If you're an outsider who want to make the most of it's time, I recommend having a plan besides going to grab a bite. Check for events or expositions in the museums or activities the delegation offers on busy days. Traffic could be horrid in most places of Coyoacan, so be cautious were you park you car or try to use another means of transportation.
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