I hate that this thread has devolved into most people complaining about bad teammates when that isn't at all what this is meant for. That said, matchmaking is in a terrible spot right now with how it is implemented.
I have over 700 games played. I should NOT be getting teammates that think I, their lane partner, is the one stealing their souls when the enemy is the one denying them. This is a failure of new player experience and matchmaking. This is an amazing game with a lot of nuance and skill expression. Taking 6 players with different ranks, getting an average and matching them with another team of 6 is not sufficient.
We understand that the game is in development and has had an influx of new players recently. Please, Valve, for your own sake, make a statement to at the very least address the issue. Staying silent for so long is eroding trust. The longer it continues, the more players will look to third parties as the venerable source of information when it comes to player skill and rank.