She has been a very strong pick for a long time now. Almost every game i play has a Janna. Just watch her winratio's over time. She is pretty frustrating to play against since she is a counter to almost everything in the game. To be an anti-engage champ and safe to play thats fine, those champs are also needed but Janna is a bit too extremely safe to play and can become overbearing. I am not saying she is broken, i am just saying she needs some nerfs/tweaks to highlight a bit more her weaknesses.