I don't see how this is an issue, various people stated that it was clearly told beforehand that it'd be too much to remodel a whole new mount, so they used Griffon Skeleton, and made a new mount which is pretty good. I honestly don't know if you play WvW or not, but its worth it there, and since its the only mount in WvW and its abilities are totally different, then yes it is "unique" in a way.