This is true, but other parts of the map data may well be of higher quality too.
I find OSM data in and around London to be more complete than Google Maps, or rather the speed of updates is faster making it more accurate and I also find data that is more granular (such as where in a fence a gate may be).
Also, OSM maps for specific purposes work really well. Nearly all of the cyclists I know who have Garmin units have replaced the maps with OSM ones just to get contours and other cartographic features that assist riding in the countryside (where fields or woods dominate most maps and more detail is needed).
This makes it sound like there are pictures of dicks in the maps. "Of poorer quality" would be better.