You just got me to the super-awesome idea to start jungling as Nunu with wards only and then rushing Shurelyas.
Feel free to visit my guide - Taric Hypercarry
In my opinion , Nunu carries early game either in jungle or as a support . His blood boil give´s a amazing advantage for ganking , team fights or just for a passive lane´ing . The main problem is that in late game , he is just like a bot , blood boils are not so effective anymore and his ultimate is just **** if not used right and if Nunu gets ccd . All tho depends on the player , enemy teams comp and the teammates .


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However we'll have to wait and see what happens once the S3 changes are live it will be a month or more for people to figure "everything" out.