Last couple of games I ahve played with her I have really enjoyed. I started off not liking defensive supports, and I still can't play Sona to save my life, but there is something about her insane sustain and the ability to really screw up enemies in team fights by strategically silencing someone as they're about to do their hyper massive kill you all Ult.
Can't wait for her art rework, but they're quite ok to keep her abilities as they are now