League is getting worst every update

Well, i honestly dont think so.
You also have to consider, E-Sports is a huge thing in LoL.
Riot has to balance every champion as good as possible, the problem with that is that Blitzcrank in low elo reks everyone because noone knows how to dodge his Q, on high elo blitz isn't good at all though.
Riot cant just buff/nerf champions based on one rank, they have to consider how they play in every single rank.