Nintendo consoles are worth buying for the 1st party titles alone. That being said, that doesn't make it a well-rounded all-ages/all-levels console it needs to be. Nintendo seems to think that they'll magically get 3rd party support, but it's been dwindling each generation. Wii had more support, but mostly from companies pushing garbage like Imagine Babies and M&M Racing. There were a handful of core 3rd party titles (stuff like Madworld, No More Heroes, Muramasa, The Conduit, Silent Hill Shattered Memories), but they were few and far between.
The WiiU is suffering from lack of games. Nintendo isn't getting their titles to market quickly enough and 3rd party devs are at best throwing scraps to the WiiU. Nintendo really needs to up their game if they want to continue to be competitive -- their online features are a joke compared to the user-friendly and modern systems that are standard on PS/XB consoles. Their console uses underpowered hardware and obsolete architecture. The WiiU is simply not an attractive platform to Western developers, and Nintendo desperately needs game that cater to more than Nintendo fanboys. They can only carry Nintendo so far.
Imagine how well the WiiU would be received if it was getting day 1 ports of popular games like GTA, Fallout, Bioshock, Borderlands, etc. Western developers are what is driving the modern game market and Nintendo can't seem to get a second look from any of them other than Ubisoft (who seems to be quickly abandoning the WiiU).
I love Nintendo, but they're either too naive, too stubborn, or too cocky to do what needs to be done to court 3rd parties.