I tried Kayle after that omegaLUL rework and it's terrible. Her early isn't this much better, just a bit safer because u are range at 6 lvl. Her late game is much more weaker. Whole Kayle state since her rework is full of shi.ts. Either overpowered or weak af.
Build and runes? Play style? Lane?
Kayle is fine just not that fun to play, and there are champions who scale harder while having absurd OP laning phases (at least against certain matchups) such as Fiora, Jax, Kled, Camille etc
Also, Kayle really doesn't have favorable match ups at all, she is a dud. Even Nasus has some match ups where he is expected to win after a certain point
Jinxylord disagrees. According to him and their internal data, she's consistently strong across all MMRs with 52-53% WR.
