This isn't a pass for Apple Maps- the last 1% is the most difficult and it's the difference between so-so and great. Apple has in the past been known to make things with the ultimate attention to detail and things that "just work" so if anything you could argue that they shouldn't have launched something that was below this bar, but apparently there were other business considerations.
BTW: From the Pier 39 website, "If you are using a GPS Navigation System, input: 2 Beach Street, San Francisco, CA 94133" http://www.pier39.com/Information/index.htm