Nunu's Ult

Can anyone explain why his ult is so r%%%%%ed? I get it, he can do mass damage that's great... However...

Almost every champ has some type of ability to get out of it.. If they don't easy.. just flash.. if that doesn't work just walk out of it and or hourglass. It's to easy to avoid unless in team fights but then anyone with a knock up can just knock you out of it. What's even more annoying is you can't use hourglass like you can with other ap champs like Morganna. Even galio has a better mechanic ult then nunu.

Unless you are really r%%%%% you can get away from his ult so easy or just knock him out of it. Which sucks because I like the champ but his ult is troll..

There is like 7 ways to avoid his ult with the most basic thing , just walking out of it. A taunt would make more sense like galios ult than a 50% reduce walk speed that you can still walk out of.