Mario 3D World

Nano Assault Neo

Batman Arkham City

COD Ghosts

COD Black Ops II

Sonic Racing Transformed

Completed:
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New Super Mario Bros U
Super Mario 3D World
Rayman Legends
Assassin's Creed III
Ninja Gaiden 3 - Razor's Edge
Lego City Undercover
Donkey Kong Country - Tropical Freeze
Child of Light
Nano Assault Neo
Injustice - Gods Among Us

Abandoned
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Pikmin 3 - Don't like being forced to use Gamepad when using Wii Remote + Nunchuk as the controls
Wonderful 101 - I can't tell whats happening on the screen, and don't care to figure it out
Darksiders 2 - I was enjoying it, just bought it with too many other games, and got side tracked
Need for Speed Most Wanted U - I don't play such a game to complete it
Dues Ex Human Revolution - Had already played on PS3, just wanted to try on WiiU
Batman Arkham City - Had already played on PS3, just wanted to try on WiiU
Mass Effect 3 - Still haven't completed Mass Effect 1 or 2. I dunno why I bought it
ZombiU - Got tired of the lame cricket bat Melee combat
NES Remix - Just played it 1 game session for kicks
Skylanders - Bought for kids, for kids that play Mario, Skylanders is too boring
Call of Duty Black Ops 2 - Played ~20 hours online. Didn't care for single player enough to complete it
Legend of Zelda - Wind Waker HD - Had completed on Gamecube. I got spoiled by Skyward Sword controls and can't stand Wind Waker controls anymore.
VC games - Just played couple of game session for nostalgia

Currently playing
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Splinter Cell Blacklist - Just bought it

There are also games that don't really have "completion" like Wii Ports Club (hate Nintendo for it) or Wii Fit U (decent) or Zen Pinball 2 (nice) or Wii Party U (awful even coming with $40 controller "free") or Sing or Dance something or other.

9 games in total:

The Amazing Spider-man
Batman: Arkham City
Batman: Arkham Origins
Call of Duty: Black Ops 2
Call of Duty: Ghosts
Need for Speed: Most Wanted
Ninja Gaiden 3: Razor's Edge
Resident Evil: Revelations
Super Mario 3D World

Currently playing The Wonderful 101 and Rayman Legends

Donkey Kong Country VC :D

WWHD
NSMBU

...

That's it

Please don't hurt me, I've been waiting out on MK8, Zelda U, X, and Metroid U ;_;

None yet, though I've nearly beaten NSMBU + NSLU, but I decided to just start on The Wonderful 101 already!

Arkham Origins
Splinter Cell Blacklist
Call Of Duty Ghosts
Super Mario 3D World
Windwaker HD
Ninja Gaiden 3 Razor's Edge
Also, I got Monster Hunter and beat all the solo missions, but would hardly call that complete. HR 15 on online though.

nslu
sm3dw(but i cant beat champion road..)
rayman legends(700 teensies)
pikmin3(all fruits)
dkctf(working on get 100%)

almost 400 hours adding everything!
just fun!

The 2 Marios, WWHD, DKC:TF & ACIV. I think that's about it. I'm working my way through Deus Ex and Rayman Legends still though. I have a serious Steam backlog too so that's taking up most of my gaming time.

SM3DW

Wonderful101

WWHD

NSLU

Lego City Undercover

Ducktales

Pikmin 3(almost done)