It's not a mistake you make twice, that's for sure. And that's the problem with maps, and why it should not have been released unless it was as a beta, alongside a functional google maps. Once it let's you down once, you lose faith in it. That is hard to restore, even if they are working hard to correct problems.
Apple also seemed to forget the way in which people use maps globally. Not only is it awful in terms of detail in many places outside the US, many places are also not as reliant on cars as America is. I live in London. I use maps a lot to navigate, to go to meetings (and personally I have no choice but to cut it fine), to find what's nearby, and so on. All of this is on foot. Even when I travel between cities I am more likely than not to take a train. Turn by turn is not a great feature for me in the way it may be for a customer in the US, and the loss of POI's and London features I am used to (clearly marked tube stations, etc) just makes it unusable.