All I know is that the Wii has had some new, and fresh experiences not found elsewhere. Now you can argue that they are not AAA titles (at least some of them) but at the very least they have some very fresh and FUN ideas. Look what the Wii did for Godfather, just a simple thing like the way you interact with the game changed its enjoyment. Boom Blox is so simplistic in its Wii mote implementation but still creates a fresh interactive experience. Zack and Wiki is the same, it has things in that game that there is no way any of the other consoles could replicate in mechanics, and some truly FUN uses of the Wii remote. Even Mario Galaxy brilliantly brought platforming to a new level by utilizing the point functionality in conjunction with the platforming.
Your other points seem weak. For one there is no way you will EVER create a game that everyone will love, it just is not possible. Also the Wii has already had defining games for it, not to mention the fact that it will more than likely cause its competitors to implement motion controls in future consoles. Also what exactly is a "defining" game? That in itself is extremely subjective, because I would say Wii Sports was followed by games like Boom Blox, Mario Galaxy, Zack and Wiki, and others. Wii is revolutionary in how you interact with games, and I think ALL those utilize this, giving the industry a chance to work with something that opens new doors to interactivity. Is it still evolving? Of course, like any vastly new system it takes time for progression to happen though I have to say I'm impressed so far with where it is at now in less than 2 years.