Honestly, as much as I did enjoy the gameplay in Kirby and the Rainbow Curse, it would be difficult to really recommend buying it at full price. Not because it's a low quality title, but because of the low amount of replayability and extra content.
I highly recommend this game for casual players and Nintendo fans alike. It's a title that shouldn't be brushed over this holiday season. My only real qualm here is that it feels more like a $30 game than a $40 one, so for those who are on the fence you may want to wait for a price drop.
Honestly, if you're a Zelda fan, I wouldn't recommend you skipping out on this title due the sheer amount of modes and content squeezed in. What I would recommend, however, is playing in segments instead of trying to beat the bulk of it at once, since the repetitive nature of the gameplay can at times get exhausting after a couple hours of missions. If you're unsure whether to take the plunge, you can always rent or ask a friend for their copy first.
Overall this game is a must have for fans of the series and newcomers will enjoy how easy it is to jump in and play. I would advise newcomers to keep up with the anime in order to get the full experience but since the game has an original story, it isn't much of a requirement. Aside from the Coliseum Mode, this has to be one of the greatest One Piece games I've played yet.