his biggest problem is that he's an item abuser and nothing else....
he's basically not a champion until you finish rylai's crystal scepter, and once you do you become the most broken shit in the game it feels like
and since you have horrendous mana costs, you need a mana item first, making him powerspike at 2 items where most popular midlaners currently spike after their 1st full item (it doesn't mean you lose as aurelion when that happens, it just means that you have a period of having to farm 3k gold while feeling a bit helpless while your lane opponent is already relevant if teamfights break out so it dampens the satisfaction of playing him)
also on his playstyle, he's basically the first ranged melee champion ever made, where you have a threat range of 600 max, and 600 min, making you super abuseable by your opponents (you can't all-in someone who has skillshot CC, because you can't dodge those without moving out of your threat range, basically ending the fight whether you dodge the hit or not)
