I see nothing wrong with the Donner cut's ending, considering that it was more or less what was in the works at the time the Salkinds shitecanned Donner, wasn't it?
The ending was fine except that it was used in Superman I and the bar scene made no sense. But they explained it in the making of feature. They decided to use the turning back time in Superman I knowing they would need a new ending to II. Then Donner was fired. So for the DVD they had two options, use the super kiss or spin the earth again. They didn't like the super kiss so the only option was to turn back time. Personally I have no problem with it. I only wish they cut the 2nd bar fight.