To set things straight about Janna
Keep in mind this is purely anecdotal, but still reasonable. Basically, lately I've seen a shit ton of Janna OP QQ threads. Personally, I believe it's Ardent and the stupid Coin gold generation that makes her OP. People say her kit is obnoxious, well so is Yasuo. But that doesn't make him inherently broken. It's the items that break Janna.
But my two cents on whether Janna is OP in today's patch, yes. She could be toned down. This is coming from a Janna player, and former main (switched to Nami). I play her for the fun of it and because I actually enjoy playing Janna, but yes she's kind of overpowered. But it's mostly just items working in her favour, much like the Draven/Death's Dance thing.