So it actually didn't work out as planned, I take it? Engines failed, because they were starved of fuel due to the centripetal forces on smashdown? (Note to SpaceX: Learn to blame the weather and high water next time!) Did it only prevent a longer hovering, or the safe soft landing was not as soft and as safe as they claim?
I guess that doesn't matter, what's important at this stage is the demonstration that they can do a controlled descent to be allowed to do those over land. I don't know if their last attempt counts, but once or twice more, and they will land over land. And any problems with the actual touchdown will be resolved long before then, and we'll begin seeing a record of actual landings (failed landings, at worst) to judge from.