When we bought our Wii, we bought the sports pack. It came with a disc that contains the sports games such as bowling, golf, tennis, etc. It also came with one controller. There's a boxing game on the disc that you need the nunchucks for and those are sold separately. You don't need the nunchucks for a whole lot of games, but, you must have them to play the games that require them. Also, in order for more than one person to play, you'll definitely need to buy at least one additional controller. The total for us for an additional controller and 2 nunchucks, plus the system with the sports pack was a total of about $300.
I absolutely love the Wii! I love the games the sports pack came with, and, my hubby was lucky enough to find a Wii Fit that he bought me for my birthday. The Wii Fit is AWESOME!! I have a lot of back problems and after I started doing the Fit, my back has been pain free! The Fit really shows you how off balance you may be and helps you correct your posture so your weight is evenly distributed. The kids love doing the Fit as well
What also makes the Wii such an awesome system is the games are more family oriented; everyone can get involved in them, and, they really help keep you off your butt...lol...True, you can sit down and do many of the games, but, I choose not to because every bit of exercise helps
The Wii has been a great investment for us (hubby is also addicted to Guitar Hero...lol) and I play the Wii a ton. I never really got into the Playstation or anything like that (I was all about the old school systems: Nintendo, Super Nintendo, Sega...haha) but the Wii has replaced all those for me...though I still can't part with those old systems...lol.
I say get it...I agree with the others, if the other systems aren't being used, sell those and replace them with the Wii. Even if the kids lose interest, I guarantee YOU will love playing the games!