Why Nunu is OP?

From trash tier to god tier in one patch

The Riot balance team have really screwed up by updating Nunu. Sure he has been weak for a long time, but by buffing Nunu to give a target champion up to 140 is simply absurd. Note, this buff was given to him for free one top of the existing effect of the Blood boil.

Riot has tried to implrement a quick fix by reducing his camp clear time in the jungle, but it simply isn’t working, for one very good reason. Nunu doesn’t need to clear jungle fast, he can just gank early and abuse his Q consume to take larger objectives later on. On top of that, his new blood boil buffs teammates which is the real OP factor, not his clear speed.