MCR01
Actually the odds of a happy outcome are not as bad as you probably think. Just off the top of my head, the Gimli Glider, TACA 737-300 that landed on the levee outside New Orleans, and Sully on the Hudson (ok, where the Gimli Glider landed was technically an airport, it wasn't an active airport). The Gimili Glider and the 737-300 were even returned to passenger service post event.
That being said, when we do safety analysis work, a non-recoverable all engine power loss is assumed to be catastrophic - happily that's not always the case.