Haven't played The Wonderful 101 yet but they're all good or going to be good titles. A 3D Mario game speaks for itself, as does a sequel to one of the best 2D platform games released last gen. Zelda is always awesome, Pikmin 3 is amazing (and looks 'next gen') and EarthBound, one of the best RPG games in video game history, is available in Europe for the very first time.
The release schedule for the Wii U is looking great until the end of the year, and then next year you've got the likes of X, Bayonetta 2, Yarn Yoshi, Mario Kart 8 and SSBU.
The 8 month software drought has been a pain in the arse but despite that there's still several must-own titles for the Wii U - Monster Hunter 3 Ultimate, Lego City Undercover, Arkham City, ZombiU, Pikmin 3, New Super Mario Bros. U and The Wonderful 101. Not bad for a console that's only been out for 9 months imo.
And now that Nintendo have seen sense and cut the price in the States to coincide with a big name first party title I'm 100% certain that the Wii U is going to have an installed userbase over 8m before the end of the year which means even the likes of EA will stop their hissy fit and support the console with software launches next year. It's all looking pretty good for Nintendo at the moment, they'll even be able to tap into the young kid market now that they've introduced the 2DS as a 'My First Nintendo Console'.