Are you a local business and need people to find you? Restaurants, Dry Cleaning services, beauty salons, dentists.. pretty much any business which requires someone to physically go to your business and interact, then you should consider using locations extensions.
What you can do to fix it:
Depending on the device you are targeting and what other ad extensions you are utilizing you may not be showing in the map 100% of the time. However due to Google’s new Adrank formula, it simply doesn’t make sense to ignore it.