I got mine in February, played it everyday until April then haven't used it until yesterday. I let my nephew borrow from July up til yesterday.
The main reason I lost interest was the lack of decent games. They all seem to be oriented to children. I'm honestly thinking of selling mine.
Wii sports is fun, Wii play is worth buying only for the wiimote.
Unless you will always be playing it with 4 people, I would get a total of 2 wiimotes, and 2 nunchucks.
I'll tell you, its really fun in a family party type setting, easy for anyone to play, but it gets boring when playing solo.