Donkey Kong Country Returns took everything from the original games, and made it all better.
The level design, graphics, soundtrack, and challenge are all spot on. Each level is bursting with creativity, from the mine-carts to the rocket barrels. This is an absolutely gorgeous game by any 2-D platformer standards, with the background actually being used in some levels of the game. The music is also extremely catchy, and very memorable, providing very well made remixes of jazz tunes from the previous games. But the challenge is what really takes the cake. This game is exceptionally difficult, and many hours will be spent trying to obtain every KONG letter and puzzle piece of the 8 worlds that this game offers, plus the bonus 9th world (only after you have beaten he game).
There are SOME things that I did not enjoy about this game, however. One is that you cannot play as Diddy Kong. It really bugs me personally, but it's not something that will ruin your fun. Second is that the rewards you obtain for getting all of the puzzle pieces and KONG letters are a little tacky. Images are not something you will strive for in this game, and won't bother to look at them more than once. Dioramas are neat, but again, they serve no purpose and you don't really feel like you've obtained something special. i wish Retro Studios gave us the option to play as other characters from the past Donkey Kong games, such as Dixie Kong, but that is just minor nitpicking.
Donkey Kong Country Returns is a must-have for any Wii owner. The superb levels, the beautiful graphics, the (at times) insane challenge and the multiplayer are all incredibly well made. You will be hard pressed to get every secret for this game, and while the prizes feel unnecessary, I could not recommend this game more.