I have been playing Yoshis New Island the past few days myself, borrowed my brothers game, he bought it. It's definitely better than the ratings it has got. The graphics look horrible in still images but in motion it's beautiful. There's more than three songs too, at least 6-7 plus remixed versions. By remixed I mean very different. The main tune which is in many of the songs is good too, composed very nicely. Good use of 3D.
It's not all good though, the controls feel much heavier than the old ones for example. But overall it's a good game which deserves better scores in my opinion. It's also harder than I thought.
On world 4 so far.