Apple Maps works great for me, if all I want to do is see my current location on a map. If I am trying to find nearby businesses or points of interest, forget it. It seems about average for finding routes, if it can find my destination. The search results are often off by 100s of miles or completely wrong, even when I know that what I am looking for is nearby.
It seems to me that Apple semantic search is bad everywhere; Finder, Apple website, Maps, etc. So maybe it is not Map's fault. Its really bad as a developer that I cannot use search in Xcode to find documentation, I have to go to Google and low and behold it brings up Apple's documentation first and exactly what I am looking for. If I use Apple's web site search it does ok, but still misses all the time.