My biggest complaint is that, like all lists, it tends to overweight contemporary entries that seem important now but that may have no lasting impact. Thom Browne comes to mind. Compare him, for example, with Perry Ellis in the 80s. Perry Ellis was hugely important then and not really remembered by the general public now. I suspect the same will be true of Browne, and possibly Tom Ford, though TF continues to drive his brand forward. Where is John Weitz? Nowhere. But I suspect the same question will someday be asked about Browne.
I suppose this isn't really a complaint. The same thing happens with music and book lists. Contemporary nominees are overvalued.