I think its the meta that has shifted so drastically the last few seasons and yet has remained stuck. What I mean by that is that you used to have a new 'class' of style of champion in each role that were in meta every few months. Bot would rotate between late game scalers, early game powerhouses, and mid-game utility. Mid used to rotate between control mages, assassins, dps mages, and snipers. Top would rotate between tanks, bruisers, and fighters. Jungle would rotate between squishy assassins to utility, etc.
It's been stuck as a full damage fuckfest for over a season now. Its the first time pretty much ever that tanks as a whole class are completely worthless. Teams can build full ad and not even have to worry about armor because of how cranked up damage is. The meta is different from what its ever been yet its stayed this way for a year so its also stale.
The damage is so high in the game right now its turned the game into a 'go big or go home' only style of game. There is no sit back and scale anymore. Losing lane is almost guaranteed to cost you the game. Snowballs are in each and every match and are practically a given with certain champions. Comebacks are harder than they have ever been.
Supports, tanks, utility players, and team-centric picks, in general, have been nerfed into oblivion thanks to pro-play and this new damage fetish riot have now. It's world of assassins, bruisers, and juggernauts. The other dozen classes and subclasses might as well go shove it. That is why the game feels worse this season. IT is, in terms of the meta.
Just like at Qiyana. An assassin with an AoE stun that she doesn't even have to hit you with, just the wall behind you. That might as well be the hallmark of the current meta.