He always have been stupid. These AP ratios are too high for spells that you can't really dogde.
His R has stupid hitbox and deals 150/350 + 80% AP to 300-500 + 120% AP with a 1300 range.
His W has a total of 40% AP + 50% AP + 35% AP. How? His passive allows him to deal 10/15/20/25/30 + 35% AP on hit and 20/30/40/50/60 + 40% AP magic dmg on a 3s Dot. So on the passive you already has 75% AP which is really big.
Now you can add the active who deals 50/70/90/110/130 + 50% AP. On one AA you can take 30 + 35% AP + 130 + 50% AP and the dot who deals 60 + 40% AP. Total : 130 + 30 + 60 = 220 base dmg + 125% AP.
And it's only one AA, he can place more AA.
In 2 spells, you have already more than 100% AP.
His Q now, applies the entire AD dmg + a 55% AP ratio. Proc lichebane. Impossible to dogde.
And his E has 75% ratio and is really hard to dogde.
Yeah, he deals too much dmg because his abilties have too much scaling considering 3/4 of his kit aren't possible to dogde without a flash.
I'm surprised he isn't played that much but it's a good thing. I don't want to see him. This champ is cancer and boring.