The quality of a choreographic work, or any work of art for that matter, can’t be solely examined in relations to one specific piece. It has to be viewed in close link with one fundamental question - does the work bares potential for a future development of an original and effective artistic process?
Some pieces, when examined separately from their potential to produce that coherent future process, might be considered as good work, but if they lack the ability to generate and be part of a larger, genuine process, they remain no more than punctual anecdotes. Lucky artistic strikes.