Routing

Because you can't fix it when it's wrong, there are many things you can't legally use the maps for (e.g. printing on a flyer), you or others can't customize the rendering (e.g. to create a cycle map or a public transport map) and the level of detail, in many urban areas, is now way worse in Google than in OSM. Look at London for example.

http://tools.geofabrik.de/mc/?mt0=mapnik&mt1=googlema...

Gerv