8 Retail Games and about 10 Virtual Console/eShop games. 3rd parties make up about 60% of the total, so I've done my fair share.

Two... but I only bought it just a Wiik ago, more will follow
Nintendoland (better than expected) and Super Mario 3D Land

DKC: Tropical Freeze is preordered and I will probably get Pikmin 3 (I love the similar Overlord games) and Lego City Undercover

2 retail: Super Mario 3D World and Wind Waker HD

2 VC: Mega Man 2 and F-Zero

1 indie: Little Inferno

More than 20:

NSMBU/ NSLU
Super Mario 3D World
zombiu
disney infinity
Fifa 13
Assassins creed 3
Sonic Lost World
Wonderful 101
Pikmin 3
Tekken Tag 2
Sonic Racing Transformed
Lego Marvel Super heroes
Rayman Legends
Lego City Undercover
Zelda: Wind Waker HD
Nintendoland

and from Eshop i have:
Wii Sports Club Tennis and Bowling
Ducktales Remastered
Nano Assault neo
Runner 2
Trine 2
NES Remix
Dr.Luigi


and Virtual Console:
SMB3
SMB2
SMW
SMB
Legend of zelda
Super Metroid
Balloon Fight
F-zero
Mega Man 2
Mega Man 3
Kirby's Adventure
Kirby Superstar
Punch Out
Breath Of Fire 2
Earthbound.

I'd say i have been pretty supportive of the Wii U Software library

I have nintendoland, Zombi u, new super mario bros u , new super luigi u and super mario 3d world

....I think I have about 18-20

I can´t look at my collection right now though.

Super mario3d world
Pikmin 3
Trine2
Rayman legends
Darksiders2

wind Waker
Nintendo land
But i still play wii games on it i bought Okami And finished twilight princess on The wii u
And virtual console games loved super metróid

I have 6: New Super Mario Bros U, Super Mario 3D World, Wind Waker remake, ZombiU, Sonic: Lost World, and Ninja Gaiden 3: Razor's Edge. So far content with my Wii U purchase although I do wish there were more exclusives that really used the system well. 2014 is looking like a good year though so maybe that collection will get larger.

Just six games, five if you choose to exclude NSLU. Had the console since launch day and got the ZombiU bundle with Nintendoland on the side. All retail, no digital, except for the Famicom 30th Anniversary games which I did get.

Nintendoland
ZombiU
New Super Mario Bros. U
New Super Luigi U (retail)
The Legend of Zelda: Wind Waker HD
Super Mario 3D World

I need more games. There's still some out now that interest me if the price gets low enough. Next game will probably be Watch_Dogs and Mario Kart 8 after that (or before that if the former gets delayed again ). Maybe I'll get Donkey Kong Country Tropical Freeze, looks good. Didn't get DKC Returns for some reason, even though I liked the SNES games. We'll see how Hyrule Warriors shapes up.

Retail 7:
Nintendo Land
Assassins Creed III
Mass Effect 3
New Super Mario Bros U
Resident Evil Revelations
The Wind Waker HD
Super Mario 3D World

eShop 2:
Trine 2
Mighty Swith Force HD

VC 2:
F-Zero
Super Metroid