Ranked should NOT take into account individual performance.
I watched a video on someone's grievances from Overwatch's ranked mode. Not only do they have similar issues when it comes to stompy games, but you can get more or less points just by "doing more damage", "landing more kills", or whatever.
This, however, means that if you're, say, a carry hero being supported by tanks and supports and junk, it's WAY easier for you to look like you're a beast and get a boost in your overall gains per match than it is for someone that plays more supportive heroes in Overwatch. Do you guys hate when people make shitty comps like this
, where there's no real supportive/defensive options to keep your carries alive since everyone's some sort of play-maker? Well that'll happen five times more if you make a gap between the amount of lp you earn for "popping off" and the amount of lp you earn for "making sure that someone on your team will pop off".