What changes were the worst this year
People collectively have hated most of the major changes made to the game this year, and im not going off the boards for this stuff like the scuttle crab changes, crit item reworks addition of conqueror were all points of ridicule at the time for many content creators and professional players.
The only reason the crit items work now is 
was buffed beyond all reason along with cost decreases on crit itemization in general, initially it killed the adc roll completely for like 4 patched. Conqueror released with irelia a match made in the literal fires of hell, the champ wasn't even remotely balanced on release that keystone just multiplied the issue. Changing aatrox into a q centric character so now all his power is front loaded into one ability despite him finally finding a niche in the meta pre rework as a sustain auto attacker.
Scuttle being the focal point of the jungle meaning if you don't have the power to contest another jungler i.e. the guy who picked 
etc. you are shit out of luck because those decide if you reach level 3 or not in a timely manner.
Worlds buffs nuff said.
