Riot Nerfs.

Think about it, any fun aspect that a Champion had has gotten nerfed to the ground.
AP Trynd? In Process of getting Nerfed
AP Yi? Nerf
Irelia? Nerf
Urf? Nerfed before he was even born
Darius? Ult Nerf
Urgot's Range on E+Q Combo? Nerf
Thresh+Blitzcrank? Nerf
Evelyn? Nerf

I'm pretty darn sure that players who've played longer than me know of more Nerfs that literally killed part of the overall enjoyment of a Champion or Item.

do they nerf that frequent in past?

So they nerfed things that are boring to play against and you complain.

nerf akali