I didn't sit and count but I am sure I have 15-20 Wii U games if not more. That said, I don't have any Wii U games that I am actively playing since I completed Super Mario 3D World back in November, 2013

So December and January and it looks like most of February, wont be touching the Wii U.Also, for February, I am leaning towards playing Thief on my PS4 over DKC TP on my Wii U.

But how many have you actually played... lets say more than 8 hours?

New Super Mario Bros U

Nintendo Land

Rayman Legends

Sonic Lost World

The Wonderful 101

Ducktales Remastered

Mario & Sonic at the Sochi

Pikmin 3

Super Mario 3D World

Resident Evil Revelations

Zombie U

Legend of Zelda Windwaker HD

New Super Luigi U

Deus Ex

Monster Hunter 3

Sonic and Allstars Racing

The Walking Dead: Survival Instinct

Scribblenauts Unlimited

Game & Wario

Splinter Cell

Pac-Man and the Ghostly Adventures

007 Legends

Ninja Gaiden 3

Rabbids Land

These are my physical games, i have more from the eshop but those weren't retail games and most VC games anyways (Earthbound,Kirby,Super Mario World,ect...)

Backward situation here, I am leaning towards playing DKCTF on my Wii U than Thief on my PS3.

Retail? 13.

Nintendo Land
NSMBU
Ninja Gaiden
Zelda:WWHD
Mass Effect
Need for Speed:MW
Madden 2013
Batman:AC
Batman:AO
Injustice
COD:BO2
Darksiders 2
Assassins Creed 3

And lots of downloads...

I have 9 retail games; Nintendo Land, NSMBU, Lego City Undercover, Game & Wario, NSLU, Pikmin 3, Rayman Legends, The Wind Waker HD and Super Mario 3D World.

For downloads I got NES Remix, plus som VC titles like Super Metroid, Super Mario World, Kirby's Adventure, Balloon Fight and so on.

6 Retail Games

NintendoLand
NSMBU
TheWindWaker HD
Super Mario 3D World
Call of Duty: Black Ops II
Assassin Creed III (Aka the worse Assassin Creed game)

Yes, this is the kind of buying behavior that causes third parties to flee from the console. Out of 9 retail games only one 3rd party, you my friend are part of the problem.

I'm part of the problem? Almost none third party games on the Wii U has interested me in the slightest, and the third parties offerings are abysmal compared to their efforts on competing consoles. I wanted to buy Most Wanted U because of the PC-level graphics, and then I remembered that the Gamepad hasn't analog triggers. I wanted to buy Sonic Lost World, until I tried the demo, and didn't like it.

If I'm not compelled to buy more third party games, then it's not my problem. For me, THIRD PARTY OFFERINGS ARE THE PROBLEMS, NOT THE CONSUMER.

EDIT. A more important case: I wanted to buy Mass Effect 3, but then I remembered that the whole trilogy was on competing consoles for the same price.

I only own 3 games, Super Mario 3D World, Tekken Tag Tournament 2 and Rayman Legends. So, 2 not Nintendo games.
I would buy Wonderful 101 if it were possible to get it in my country, I may import it later this year.
I recommend Rayman Legends to any Nintendo fan (I imagine all Nintendo fans like platformers), it is really excellent, really deserves the 91/100 on Metacritic (for me it is a 10/10) and Tekken Tag 2 if you like Tekken, although sincerely the communities in other consoles are much more active.