User blog comment:V0ldek/The biggest mistake of Season 3/@comment-7996065-20130416140951

The previous system wasn't much better, some people were still carried into plat / diamond where they can ride the carrying potential of their teammates (by only picking safe roles such as top or support). This is the only way I can explain how such terrible players can stay in plat / diamond. The only way to fix the rating system is by either doing statistical matchmaking (attempting to capture actually how WELL you do in every game as opposed to going soley by win or loss) or by evening out the importance of each player or role. Both solutions have their problems, problems no company should be willing to invest into solving since that would take up far too many resources for the effects it would bring.