Is Kayle Too Stronge? [WALL OF TEXT]

I'm not sure if I'm right or wrong on this, but I think Kayle is a bit too strong. I don't play ranked so yes my opinion doesn't matter of course (lol), but I think her ult is way too strong late game. (36 sec CD with max CDR fully leveled) Tryndamere's ult is similar to Kayle's, but his health can still be brought down, which really sucks. Yeah he gets more damage for missing health but you're not gonna leave a teamfight with 70 health when you're a melee fighter. I've come across a problem like this with _Yasuo, however the solution was me having to not be dumb and pay attention to the particles, learn his damage output ( how strong he hits ), and playing him. Playing as Yasuo against Yasuos in one for all changed how I thought since his abilities are, hard to master. Yasuo takes a lot of skill to play even though he's super strong. However I think Kayle is different, she's incredibly easy to play and just too strong for being simple. Her Ultimate makes her invulnerable to any damage, but not any cc. This makes it near impossible to 1v1 her unless you've some ability that removes buffs from enemies or, just have a _Zhonyas, or just do enough damage in a small patch of time to decimate her. If I'm a fighter like Fiora or maybe Jax(although being late-game gods), her ult is super annoying, since you rely on basic attacks that are upfront and in the enemies' face. Any time she activates ult in the middle of a fight, (not team fights) your a bit screwed, since her passive reduces armor, her E gives more AA damage, and I see lot of Kayle's going for AS. So I think its a super ridiculous combo against fighters.

Now tell me if I'm wrong and or if I am completely wrong and stupid.

(This is my first post by the way, I know I'm whiny.)