Hmm... let's see..

ZombiU
Assassin's Creed 3
Assassin's Creed Black Flag
Mass Effect 3
Bayonetta 1
Bayonetta 2
Deus Ex Human Revolution: Directors Cut

Both bayonetta's and that's it actually and it will probably my only M rated titles, unless platinum games makes another WII U game or the next metroid becomes a mature title.

I have only Assassin's Creed 3 but I will get Bayonetta 1 +2 for sure and maybe Assassin's Creed 4 if I like the 3 (it is my first Assassin's Creed game...). ZombiU is also a game I may be interested in...

It may sound crazy, but I NEVER pay attention to the ratings of the games I buy. Never. I even don´t remember how each game is rated...
Well.. those are in my collection: Assassin´s Creed III, Assassin´s Creed IV, ZombiU, Deus Ex Human Revolution, Bayonetta 2. I have also a copy of CoD: Black Ops II but it´s not working anymore. 06 in Total.

Bayonetta 1
Bayonetta 2
ZombiU
Splinter Cell
Assasin's Creed 3
Assasin's Creed 4
Darksiders 2

Just "Bayo 1/2". I play mostly Mature rated games on other consoles and would play more on the U if more strong exclusives were available.

COD- ghosts/Black ops 2
Splinter Cell
Bayonetta 2
AC 3/ Blackflag
Ninja Gaiden 3
Deus Ex
Sniper Elite
Darksiders 2
RE-Revelations
Zombi U
007 (is that m rated?,there is tons of killing)
Mass Effect 3

But I have to support all three home consoles and both portables!  I did the best I could.  

I guess the king is dead.  Long live the king.

bayonetta 1n2
zombiu
AC IV (i swear, this 2 will be my last ubisoft game)

Same here.