I believe he is a bad tank (he can, but like he's not good at it)
not that great as support and bad damage in general (unless ap)
If he jungles, his ganks it isn't that great of a gank and has no damage while ganking
only 1 damage ability (expect for ultimate, which can be canceled)
i think riot should think about reworking nunu :) 
I think Nunu is fine the way he is right now. I love the big fellah.
Yes please he has some great abilities for a team cc comp but he lacks usefulness in lane other than heres some attack speed or oooooh let me stand in the way.
No. Absolutely no. Nunu already has 1:1 Ap scaling on his snowball. Not to mention that his ult is greater than 1:1 scaling. The fact that you can cancel his ult makes it so nunu is a situational pick that can fit extremely well into the right team composition and not an overwhelming monster of a champion that can quite literally snow ball out of control in every game.
I would like them to add some dps to his autoattacks...maybe have his e debuff the target so it takes bonusdmg from nunus autohits or sth. - right now he really would need some more sustained power, because he just does not scale if he cannot get a perfect ultimate later on in the game - which only happens in 1/100clashes.
I don't have trouble playing him support. Honestly, I think he's a strong pick with the right adc champions like Sivir.
it would be nice if Nunus blood boil would also do AoE damage to enemies nearby him and his target. This would makes his ganks a little better or at least be of use when he goes to a lane. Also his q would be better if he could "regurgitate" what he ate to cause damage at the price of not healing as much (like Syndra's force of will)
