I don't know why people continue to believe this. Apple has released versions of the Finder with amateurish bugs that delete files[1] and versions of Mail that randomly delete messages[2]. Several versions of Mail on iPhone send hundreds of copies of a message when emailing a link from Safari[3].
The Maps fiasco is not a departure from software excellence on the part of Apple, but just more of what we should expect by now: shiny stuff that doesn't work.
[1]http://tomkarpik.com/articles/massive-data-loss-bug-in-leopa... [2]http://discussions.apple.com/thread.jspa?messageID=12758081&... [3]http://lee-phillips.org/iphoneUpgradeWarning-4-2-1/