Senna is proof that the Balance Team knowingly disregards their own lines and limits
Short and to the point: Every single ability in Senna's kit, save for her Q, is something the balance team had sworn not to implement because they had said it was too broken.
Passive enhancing crit chance? ADCs would gain unfair gold advantage and make for easier crit builts which are intentionally crated behind large gold costs to keep the power in check. Yet Senna gains it for free because fuck you and your elo.
Her W AoE Hard CC on a Basic Ability? The very few champions that have it need ridiculous conditions to meet (Like Xerath needs all 5 champions to literally stand ontop of each others hitbox wise, same as Anivia), yet senna gains it with a very large range IN COMPARISON because fuck you and your ELO
Her E AoE Shroud-knockoff? Not only is it an AoE camouflage, when you immediately leave it or if it ends, all 5 champions are covered in an animation so you can't tell who is who. Riot has vividly expressed to never give an ability to stealth the entire team because it would make for borderline broken and frustrating mechanics, yet Senna has it because fuck you and your elo
Her R A GLOBAL beam? The only reason Lux' R, a Beam of the same kind, has a limited range is because making it global was going to be too powerful on a support-ish damage dealing champion, yet senna has it because fuck you and your ELO. And the delay from one map side to the other is, based on the so far leaked footage, less than seconds. Ezreal's R for example takes nearly 20 seconds to reach top lane outer turret from bot lane outter turret, but Senna's Beam, based on the Footage of This Video with Timestamp takes just below 2 seconds. I REPEAT, A GLOBAL BEAM WITH TO-EXPECT ULTIMATE DAMAGE ON AN ADC LESS THAN 2 SECONDS DELAY FROM MAP END TO MAP END
Senna is the embodiment of disregard to every single line drawn in the sand when it comes to balance choices being made and which mechanics were purposefully avoided.
This champ can be broken or underpowered, but the one thing she certainly is is a big, fat sign of disrespect to the balance.
I can only hope they will change those mechanics out before release and make it fair because no matter what, she will be way too unfair to fight and will be incredibly frustrating.
Edit: People really seem to love changing their minds. The Page reveals and the Skin Spotlight video on YT explain the very same issues and these comments get thousands of upvotes yet here the very same words and critics are negatively received.
@Illabethe this is what I mean by white nighting a post. Facts and statistics don't lie Senna is broken and overload stop trying to defend her abilitys when you know the champion is overloaded and is extremely lane dominate. "discovered the counterplay/limitations, and trying to compare apples to oranges in the ults." weird how you defending her wholehearted when you have been spamming the champion. sounds Biased to me