Overall, I think The Walking Dead ended about as well as could be expected.
There were mistakes made along the run of the series that made a perfect ending impossible -- I mean, there was no way to handle the Rick thing, on top of wrapping everything else, in one episode.
Still, it was an emotionally poignant finale which did serve as a good send-off.
No matter how you put it, it's a curse of the television medium that it's almost impossible to resolve a decade worth of content in a satisfying way.