I disagree with this wholeheartedly, even though I completely understand your frustration. The system works well, even as much as it pisses me off that I'm still stuck in Bronze. Even though my own stats are decent and my KDA is higher than the vast majority of people I play with, I can't compensate for the other 4 players on my team.
However, I recently discovered that I had a lot to learn about the game, even after 4 years of playing it. One tiny change in my gaming style and I've been climbing the Bronze ladder rapidly lately. I'm currently sitting in the series to get into Silver, and I've done that completely through solo-queue. Instead of blaming the system, figure out what you can do to improve yourself and your team.
For me, it was simply realizing that I was really good at playing well individually, but I played a lot of champions that didn't bring much to the team in terms of synergy and abilities. I changed the champions I play in given roles and started focusing on what the entire team needs instead of just what I'm good at. People keep telling others in the lobby to "play what you're best at" but this logic is flawed and that's a big reason that they are stuck in Bronze. Learn champions that have massive teamplay and encourage other people in your lobby to choose the same type.
In short, learn to play Galio.
He can save a noob team from losing if you can play him well enough.