Okay so yes I only just got this game, but its a music game and to be honest, there is never a lot you need to know with music games. The important part are the controls, the responsiveness and the difficulty. Then all you need to know is whether or not you like the soundtrack
http://en.wikipedia.org/wiki/Samba_de_amigo#Wii_version
the soundtrack can be found following this link, but having played the 2 previous versions - to some extent - and knowing that some of these tracks would be coming back and some new ones would be joining them. The chance to make an idiot of myself maracaing along to things like the theme from rocky, tubthumping etc was kind of appealing. Being a wii game the graphics are not top of the line hi-def or anything, but then neither is guitar hero or rock band - beyond the over the top opening videos and there's no need to be. There are different ways of controlling this game, thankfully theres no need to buy gimmick controllers (although there are some maraca add-ons for £10 approx available). The first is the obvious wiimote-nunchuck combination, but I opted against this because the wire between them bugs me. In what I believe is a first on the wii, you also have the option of using 2 wiimotes and this is the option I went with. It may have been something to do with how I calibrated them on start up but theres been a few instances where it either hasn't detected the shake properly or perhaps I was slightly off. So I suppose this is a slight issue. But it hasn't really affected my performance, I've yet to perfect a song but I haven't played the same song twice but there have been several almost perfects. This compared to what I used to be like at the Dreamcast versions is almost a hundred percent improvement. The Dreamcast version calibrated itself based on your height and you held the maracas high medium and low. On the wii you hold them upright/horizontal and downwards to relate to the high/medium/low of before. So even if they may not track perfectly I would say the controls are an improvement and I've been having a lot of fun with the game.
Overall I'd say its a great party game, and being a wii game it can be found for a reasonable price - mine set me back £30 which I would say is value for money, but to decide if its worth it for you you have to check out the track list and a general like of samba music.
Quick and easy review because I wanted to write something while my food was cooking.