Janna sucks idk how you guys are good with her

Just tried her out and it was horrible. Still won but unlike your comments earlier I feel that Sona brings the pain please.... Sona can heal in the teamfight. I never could land one good ult maybe cause it was L O L burst team on each side one second wins no sustain teamfight but in the case even sona does it better with heal sustain. Only disengage is better but sona brings more damage/