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Part of the reason for eating wild edibles is because they have tons more nutrients than cultivated plants. This is due to the hybridization process to increase one or more desirable attributes. I suppose it's possible to increase nutrient density by hybridization, but that is usually not the goal; the goal is usually look, texture, size, color, etc.
The grass in your backyard is cultivated for color, texture, and uniformity, not for nutrition. If you are just looking for free food, it might be sufficient. But if you are looking for the best food you can find for free, then maybe you should allow some of the 'undesirable' weeds to take over.
Or perhaps you could plant part of your yard with more traditional edible grasses, like wheatgrass. Ann Wigmore's books have a lot of info on growing wheatgrass indoors, which could also be adapted for outdoors.
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