Karma thoughts. Underpowered?

I have tested her with the E buffs, and I don't get why isnt her played. She has a good burst (w, Q+Ult), one of the most powerful pokes as support i think She has one of the longest CCs( root and stun i mean) in the game (3.25 sec) With those buffs Karma got an Incredible shield. I have reached the 1000hp shield+ 50% to the rest of allies With 45% CDR ultimate has very low CD. In a teamfight you can use it a few times Any idea why isnt her played? I mean on soloQ, not competitive
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