The meta as I know it summed up.
Assassins get shit on by champions classes they're supposed to counter then get called broken for actually killing someone.
People only play 3 jungle champions.
Supports are capable of granting thousands of effective Health to several targets at once or can choose to pick someone that they really don't want dead.
ADC's can go mid with ignite, walk at people early game, then just rush a late game anti tank item and an item designed for juggernauts or even buy items for assassins and then proceed to "outskill" everyone.
Assassins get called broken for killing people in a full rotation but mages killing people with 2 basic abilities or even by only pressing R is perfectly acceptable game balance.