Riot sets a meta no matter how much they say they don't.
Currently high burst damage champs with great mobility/escape and maybe little tanky dominate the meta. Riots game designers have told us in the past they hate champs with sustain and don't like hard cc. Well guess what kills and stops champs like zed instagibbing someone or allows them to survive burst of jarvan? Sustain and hard CC.
Riot has nerfed all sustain champs. Vlad, mordekaiser, aatrox etc. Nerfed all the hard cc in game, annies stun early game deletion of old sion. So now what do you get? A meta with safe pick champs with no real counters. Note if riot hasn't nerfed their sustain or cc capabilities they nerfed their damage like gragas.