I think this season is worst ever. Here is an example: Fiora.

http://postimg.org/image/j5pnok2sp/

Starting from Sion rework and Gnar release - both tanky and can deal tons of damage with 0 damage items. Sion before nerfs was actually unkillable on lane.

GP rework - which doesn't truly has counterlplay (put one barrel in bushes, another one on lane - no way to stop it) and Ekko (invisible stun - still can't get idea of it, we're trying to fix invisible spears of nidalee and same time getting new champ with intentionally invisible mechanic).

In 5.18 Repertoir said that Darius is balanced. Now he has 90% pick/banrate on Worls, and nerfes on PBE that going to finally kill him.

So Fiora. Look screen - 55% of her damage is TRUE DAMAGE. Wtf? After game she had stats: Total damage to champions: 45k damage, Physical damage to champions: 25k.
Slows, speed buff, true damage, OP shield. Riot always talk about counterplay. Where is a counterplay for new champions? I'm playing since s2, and really, never seen anything like this (except assassin, tank, ADC etc Lee Sin), new champions and reworks sucks - flashy and overloaded.

Don't know what happened with game (Ghostcrawler came?), but hope next seasons will be better.