This depends on what you want to do. If you want to use OSM to find address, then it might be ok.

If you want to create directions based on live traffic or find POI/business on map or have street view of location/route, then good luck. Google map have many datasets that just not available or too expensive for competition:

  - Street view
  - User upload images of places
  - Pedestrian and car traffic
  - Public transport information and timetables
  - POI and business database
  - Consumer reviews
  - High quality aerial images