I didn't vote yet, so some of these are oldies!
+1 Nintendo Land - I was underwhelmed at first, but the more time you put in the more fun you have with it
+1 New Super Mario Bros U - great fun, well designed levels etc. etc.; I'm sure you know what you are going to get here
+1 New Super Luigi U - a nice difficulty upgrade over the original, but be warned: the levels are shorter (99 sec stage limit!), however there are plenty of them
+1 Super Mario 3D World - really good fun, and much more than a 3D Land sequel. Polished, tight, excellent.
+1 Rayman Legends - sooo much content and really visually stunning, I should have picked it up sooner!
I'm also getting a kick out of these:
+1 Need for Speed: Most Wanted U - Criterion really know what they are doing with racers!
+1 Sonic & All-Stars Racing Transformed - will pacify me until Mario Kart 8 arrives...
+1 Nano Assault Neo - great little twin-stick shmup with co-op