11 retail and 8 eshop. Bought the system on launch day, so my average is around 1 game per month.

18 games right now, I've got like another 5 (at least) that are out that I want and there are plenty of upcoming games I want and none of this counts eShop/VC games (of which I have two and will get more once my money and time budgets allow for it--has less to do with not enough time to play all the Wii U games than not having them in the first place).

I never had the feeling that there aren't enough games. Here is my collection:

-ZombiU
-NSMBU (NSLU)
-AC III
-AC IV
-CoD: Black Ops 2
-Nintendoland
-Monster Hunter Tri Ultimate
-Pikmin 3
-TLoZ: Wind Waker
-SM3DW
-Splinter Cell: Blacklist

I am going to buy Wii Fit U and Donkey Kong^^

Retail:
- Super Mario 3D World
- Rayman Legends
- Sonic Lost World
- Pikmin 3
- Nintendoland
- Super Mario Bros. U / Luigi U

eShop:
- Pokemon Rumble U
- Might Switch Force: Hyper Drive Edition
- Dr. Luigi
- Sketch Academy
- Nano Assault Neo

Nintendo Land
Mario 3D World
TW101

Soon, DKC.

On disc:
Nintendo Land
New Super Mario Bros U
Super Mario 3D World

On my Wii U:
Wind Waker HD
Toki Tori
Earthbound
Racing game who`s name i can`t remember

Plus other VC games i had on Wii that i moved to Wii U.

Disc (20)
The Amazing Spider-Man: Ultimate Edition
Resident Evil Revelations
NintendoLand
Wii party U
NSLB U
ZombiU
Darksiders 2
Lego City Undercover
Mario 3D World
Sonic Allstars Racing Transformed
Pikmin 3
AC III
AC IV
Splinter Cell: Blacklist
Need for Speed : Most Wanted U
Sniper Elite
Hot Wheels: World's Best Driver
Game & Wario
Scribblenauts Unlimited
Rayman Legends

Soon! (5)
Deus Ex: Human Revolution
LEGO Movie Videogame
FIFA 13
Donkey Kong Country: Tropical Freeze
Tekken Tag Tournament 2

Later (4)
Sonic Lost World
TLoZ: Wind Waker
Wonderful 101
MK8

eShop/digital/VC (9)
Earthbound
Edge
Rush
Knytt
Sketch Academy
CastleStorm
Zen Pinball 2
NES Remix
Trine 2: Director's Cut

Soon! (4)
Art of Balance
Fast Racing Neo
F1 Race Stars: Powered Up Edition
Puddle

4 (not including VC)

Mario 3D World, Pikmin 3, Wind Waker HD, Game & Wario

DKC: Tropical Freeze coming up next month.

Do I have to count Eshop games too? Then it will be.... 32

20 retail games (physical media)
06 Virtual Console games
06 Eshop games

Retail wise 11-15:

Nintendo Land (bundled)
NSMBU + NSLU
WWHD
SM3DW
Deus Ex
RE:Revelations
Rayman Legends
Wonderful 101
ZombiU
Arkham Asylum
Arkham Origins
Pikmin 3 

Ninja Gaiden