Lol ranked promo system sucks

Short and sweet. I can't stand the LOL current leveling system. They base promotion or demotion simply based on winning and losing. None of your actual in game player skills matters.. just winning or losing.

Why not base your success of failures on your scoring? We get rated based in multiple variables every game and a final letter score is awarded. Why not use this rather than winning and losing? I know we have all been faced with a teamate that doesn't know what they are doing.. and so they feed and feed. Perhaps this example may be a shitty argument but what about thr disconnector? Or the "I just realized I have to take an enormous crap" mid gamer?

Personally, I feel that LOL should allow an option for the game to remake if someone disconnects from the game for dc or no activity greater than 2 minutes at any time in the game. . Not just the 1st 5 minutes.

Yesterday, I played 3 ranked games. All 3 ranked games back to back I had disconnectors or someone that disconnected and reconnected 10x. It's 4v5.. it's a slow and painful death. Why not spare the losing team and give them a remake due to technicality.. of course, you must punish the disconnector. So now my ranking keeps plumiting and the lower rank I remain the more shitty dc players I am forced to deal with. It's a vicious cycle. I hate you league.