Wii Play isn't bad. I've only played it with two player so far, so it wasn't as frenetic as it could be. The tanks mini-game and the cow racing game are the most fun.
I managed to get it yesterday, it's tons of fun. One of the coolest things about it is how Mii friendly it is, as many Miis as possible are taken from your parade and plaza whenever you have any Miis wandering around. For some reason my copy likes using the Hitler I got from Wizardmon as much as possible.