I got a little time with Wii Play tonight. Overall I'm not too impressed--it feels like another collection of tech demos--but it does look good and the games play pretty smoothly. The one game that impressed me was this tank game. It's apparently played like some old game called Combat, but the bottom line is that it's fun. Really fun.
I'm not sure if it's fun enough for me to buy the whole game, but I'm seriously considering it. I wonder if they'll release the individual games on the Nintendo store?