Seriously, Riot? Nunu is a complete MONSTER!
Really? Everyone is complaining about Conqueror, Irelia and whining about bot lane diversity.
But the real problem
THE REAL REASON THIS META IS CRAZY
Is 
THIS CHAMPION IS A COMPLETE BEAST! LOOK AT THIS MONSTER OF A CHAMP AND TELL ME TO MY FACE HE IS BAD. BEST 1v1 POTENTIAL IN THE GAME.
And don't even get me started on this assassination potential!!!
I MEAN, HOLY CRAP!
I mean, 600 FKIN DAMAGE ON HIS RANK ONE ULTI? (of course you have to channel an easily avoided aoe) BUT THATS NOT IMPORTANT!!! THIS GUY'S DAMAGE IS COMPLETELY INSANE!
MASSIVE TRUE DAMAGE Q (only on minion/monsters) BUT STILL! THIS GUY CAN ASSASSINATE CASTER MINIONS THE QUICKEST IN THE GAME. HOLY CRAP.
The only handicap he has is when he's used in the funnel strat. Ugh. Thank god.