I don't understand how/why Riot seems to think Senna is balanced. She has more abilities in her kit than most champions ever have.
AoE root with huge range, and a nice hitbox. AoE move speed buff for her team, that also makes them somewhat untargetable. She has a Q that can target basically anything, and the fact that it can even damage towers is ridiculous. She has a global shield(on a relatively short cd for a global ability btw), that has probably the fattest hitbox of any ability(although the damage portion is small). On top of that, she heals.
Her kit is so overloaded, it doesn't have any one specific use...as most other champions do. Her kit is illogical for that reason. Not to mention, ok so she gets range from her passive...whatever...why does she get crit chance too? Why is it that just her passive alone, has about 3 different things happening in it.
There's so much going on in her kit, that when you hover over the spells with the mouse...I doubt it even shows the majority of what's going on.
I don't even care that her damage is big or that she gets to have a ton of range...that's called having a unique kit. But when they give her every possible tool in the game, plus getting multi tools between her passive, Q, and R, it's just absolutely bonkers. The champion isn't the most busted that's ever existed, but it might be one of the worst designed ones, in my opinion.