Nintendo's little console that could is shattering sales records left and right, and might just move more units in 2008 than any game system in history. http://www.freshbite.info/fnews_1228271897_11143.htm
Family games, quite a few good ones. Quality single player games? None, it's a -terrible- console for slightly serious gamers, but a great one with friends/family.
It has some good single player games. I only have one wiimote and I've had reasonable usage out of my wii. The ratio of good games:bad games is appauling though.