I'm not botching him so much as it's hard to play from behind as Azir. With other mages you can ALWAYS at least fire off your abilities before dying, even against Hecarims and shit who you have no chance of getting away from. This means that the 'contribution floor' for Azir is far lower than other mages.
Kayle's Q is super strong burst, her ult lets her completely resist telegraphed attacks like Fizz Ult, and she does the same amount of sustained damage while also having an 'execute' button with her E. She's so much easier...
I'm not garbage at him, 44% winrate, with my main being Ryze at 67%.