ZombiU, New Super Mario Bros. U, and Nintendo Land are all great, and there are some pretty good multiplatform games too.
The Wii U has been out for about half a year. Has ANY console actually had even a decent library at this point in their lifespan? Basically every console starts with a couple mediocre exclusives, one or two good exclusives, and a ton of ports. (And god forbid if they're bad ports.) It's usually only the fall following a console's launch that good games start coming in any appreciable number.
Again, that's the norm six months into a console, Nintendo or not. If it bothers you, don't buy a console at launch and just wait a year or two for more games to be available and the price to drop.
The Wii U has been out for about half a year. Has ANY console actually had even a decent library at this point in their lifespan? Basically every console starts with a couple mediocre exclusives, one or two good exclusives, and a ton of ports. (And god forbid if they're bad ports.) It's usually only the fall following a console's launch that good games start coming in any appreciable number.