It's not as if google's map is without problems. Even when it comes to finding shopping opportunities, depending on what you're looking for (computer shops, locksmiths) it can have a lot of locations on the map that don't exist in reality. And then for something like fast food you can assume it's more prominently showing whichever chain has paid the most.
Maybe it's worth it if you need to be sure of finding the nearest McDonalds, but it isn't the map I'd go for first for most things.