It's worth $10 if you like the idea of a shaking maraca rhythm game and can put up with how much more inaccurate and fiddly the controls are than the Dreamcast home version
I ordered Samba from the Gold Box last week and today I got an email with a coupon for $5 off an Amazon Game download. Apparently you get one with any Wii game purchase. So if you want to try any of those new Amazon download games then this is a really good deal.