Most Impressive:
Actually nothign at the current moment for I feel the Wii can do more impressive games. Trauma Centre looks like the best use of the Wii-mote, as does Wii Tennis if they added a little bit more depth to it.
There is Super Smash Brothers Brawl but that is solely because Melee was so good.
The Legend of Zelda: Twilight Princess: Self-titled "The best Zelda yet" by the development crew, that is all I really need to know especially after the great and epic OOT, the short but sweet majora's maska and the refreshing Wind Waker. A game with the play-time, the graphics, *from the looks* a great story... *faints*
(unconfirmed) Cooking Mama: OMFG! Imagine stiring, chopping, whisking, beating, tenderising etc etc. It will possess loads of recipes and you can cook with other people online e.g. as a team of 4 as co-op you can compete against other people. Following a theme like "You are cooking for a wedding!" or " Prepare some nosh for a a 8 year old's party!"
*dreams*
Least Impressive:
Metroid Prime 3: Seriously to think they could have done a little bit more with the series. The extra left hand use is nowhere near "impressive" in my eyes as it doesnt add a great amount of depth beyond, say, giving you an extra weapon.
The graphics also look sub-par and from the gamecube, very little work IMO was put into the graphics.
Wii-Trucks (forgot the name): A truck game which just capitalises on tilting the wii-mote up and down. I can see this game becoming a 4 for 20 pound-er.
Project Hammer: I cant see anything beyond the hoaring of the wii-mote.
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XD