I'm buying her because she's cute.
... In all seriousness, I think her skills make her as good as Janna, and since a lot of her abilities have dual effects when used on ally or enemy, she has an incredible amount of utility. She does seems like Karma in that sense, but easier to play, since you don't need to add in the mantra. Oh, and she actually has a castable ulti. ._.
w/e I'm still playing her as a full support. I'll miss the heals that my usual Soraka dishes out but I'll manage. T-T