I bought a Wii about a month ago... The sports that comes with it made my right arm sore for a few days, and I lost interest after a couple of weeks.
Last week I bought Rock Band. I knew I would get into playing with the guitar, and knowing that I would kick myself if I didn't get the drums and microphone I went ahead with the complete kit. You can play solo on any of the instruments(including bass guitar) or up to 4(1 additional guitar required) people can join in all playing an instrument or singing.
I play solo guitar on the Wii quite a bit and it's not anything like playing a real guitar(much easier). Also, I've had more company in the last week than I've had in the last year. We were all up late Friday and Saturday night playing Rock Star..... It really is quite fun to "Jam" with others on the Wii.
Oh, and just FYI.... With the Wii........ Guitar Hero and Rock Band are not compatable with each other.
