I respectfully disagree with all of yours. I guess mine would have to be:
1. Zelda WWHD: Pure Nintendo, even if you have played the original this classic should not be passed up. While IMO it is not as great as its other 3D brothers, that doesn't say much because they are all masterpieces. The HD really brings out the characters and their expressions, as well as making the sky super beautiful to look at! It is most definitely my favorite Zelda in terms of environment and exploration, while it did loose some greatness with its shotty dungeons. But still, a great 25 hour adventure worth your time.
2. DKCTP, the game has amazing graphics, fantastic music, and most of all it is probably the best side scrolling platformer made in the last decade. It does everything its predecessor did right, with more (with the exception of game length, but that was worth it because everything in the game was amazing). It is the epitome of a Nintendo platformer and should not be passed up.
3. Mario Kart 8: by far the most inventive, most beautiful, and most fantastic Mario Kart to date. It does everything right, and it deserves its spot as the pinnacle of Wii U gaming. It is fun by yourself, fun with friends, fun with Families, and super fun online. The game looks so fantastic it is hard to not love it.
With these three games you cover quite a bit of gaming niches, maybe if you do not enjoy ZWWHD, swap it for Bayonetta 2.