Make MMR/LP gain and loss based on individual performance
I'm sick and tired of stomping in game yet still losing the same amount of LP as the ADC who decided to first time a fotm champion and then go 1/13/8 before proceeding to flame and grief my jungle.
I get that we all have bad games but I don't believe a mid laner who wins lane, wards, has good cs, positive kda, good objective control, etc should be punished the same as the top laner who went into lane, fed 2 kills early then started sitting under turret and flaming for a gank without even trying to cs and play the game properly, it just isn't fair. At the very least you can make your report system work so players who int actually get what they deserve.