1. Apple Maps
Unlike Google and Facebook, Apple doesn't subscribe to "build fast, fix later" approach. When the Cupertino, Calif. company releases a product, people expect it to be polished and work correctly the first time. So when Apple released iOS 6 and people fired up the new Maps app that replaced the Google-powered version, everyone expected it to run without so much as a hiccup. That's not what happened.
The new app paled horribly in comparison to the outgoing version. It lacked transit directions, information about businesses, and, worse, gave incorrect directions. The directions it delivered were so bad, a few governments considered the program a hazard. The debacle forced Apple to publicly apologize for the shortcomings, clean house, and promise to improve the app.