Kayle: Danger Signs of a Problematic Kit
I say all of this not as a Kayle hater, but as a longtime Kayle fan. She was one of the first champions I got remotely good at, and I've long enjoyed playing her.
The reason I love playing Kayle isn't because of her power. I like the power fantasy she offers. Angels are my favorite mythological creatures, and the retributive angel motif is a lot of fun. I like Kayle's visual design as well. But I have to admit that we're seeing a lot of danger signs that her kit is problematic.
Kayle has been nerfed continuously all throughout the end of season 3 and all of season 4 so far, with only a few small compensatory buffs to parts of her kit that remain weak. The thing is, despite all of those nerfs, you can still point to areas of the game in which Kayle is just utterly dominant, combining mixed damage output with range and the ability to apply all of that damage at an incredible speed. This is all apart from her ultimate, which is its own thorny set of problems.
Combining high utility and high damage is always a sore spot, especially when weaknesses in one area for other champions are justified by the idea that the two should not be mixed. But temporary invulnerability on a short cooldown, speed boosting, and (admittedly anemic) healing, all of which can be applied to any friendly target including Kayle herself, is not overwhelming by itself, but combining all of that with Kayle's damage output is a bit much. The thing is, destroying her damage output by constantly lowering her attack speed and ability power ratios is not a long-term solution to the problem because her utility isn't strong enough on its own to allow her to be a competent support on the level of Thresh or Leona.
As far as Kayle's damage output, she combines physical and magical damage as well as a stacking shred on both resistances, all of which scale with her attack speed and cooldown reduction due to the scaling and passive-stacking on her Q. This is an almost Vayne-level ability to deal solid damage no matter what your opponent builds, which is problematic no matter what the numbers on it are. Basically, you couldn't possibly nerf Kayle's damage enough to make this design non-problematic.
I don't want to preserve Kayle's status as an overpowered all-lane beater who can shred down a tank in seconds and also make herself invulnerable at short intervals. I just want to be able to play an awesome angelic warrior who charges into battle, lifting her allies' spirits and fighting capabilities along the way. Whatever Kayle can look like in the future, it's apparent that it cannot be a version of her current kit with numbers shifted around. Kayle is showing all the signs of a champion in need of massive overhaul.
I don't have any solutions myself; no ideas about what this remake might look like. I am not familiar enough with the mechanics of League of Legends to make calls like that. I have ideas for what sounds like it would feel cool and deliver on the power fantasy, but I'm not nearly knowledgeable enough to know if any of it would be feasible. I just know that the current trajectory on her abilities is unhealthy for her as a champion, and for the game in general. Anybody who needs that many big nerfs in a row and continues to be a dominant force not just as a pubstomper but in ranked and even championship play needs more than a little tweak.