If you find an inconsistency with maps, either drop a pin or select the location's pin and tap the blue arrow. Scroll to the bottom of the page and tap the Report a Problem button.
Here you can choose to report that 'Information is incorrect', 'Pin is at incorrect location', 'Place does not exist', or report a different issue using the 'My problem isn't listed' option.
For example, in the images below you can see that we reported a minor issue with the location of the Apple Store Masonville. We were able to drag the pin pointing to the location of the store from a bus stop to its correct location.
Hopefully with the help of users and the company's aggressive hiring, Apple Maps will soon become usable.