iPods were fun to use, iPhones had enough UI differentiation with things like blackberries to be "different".
the Apple Watch doesn't seem to have that. As a cousin post commented, Android Wear's UI almost seems more Apple than Apple's own UI.
Maybe the Zoom-UI and the crown are it. maybe this will tackle people's issues with usability. But there seems to be little differentiation. I won't argue about it being the best on the market (it might be), I just doubt this changes the marketplace as much as we might want.
This might end up being like the iPad. A lot of people ended up buying iPads, but unlike the iPhone, we didn't get a very large new tablet market from it.