Ranked games and normal games should have some differences in gameplay
Riot follows the ideology that RNG adds some spice to the gameplay and that shorter games means having to adopt different strategies. The thing is, that ranked would be waaaay more balanced if the round winner damage would be lower (thus making games longer and giving room for players with a bad early) and RNG tuned down.
It's all fun and giggles to sometimes have busted RNG on our side, but this be more part of casual gameplay, ranked should be less RNG, more strategy and planning.