It can't be denied that the lower the rank goes the more out of whack the matchmaking system is.
On one hand, I believe that rage posts will not bring any positive effects. By this time the devs know that, and one more angry post will not do anything to bring more attention to it.
On the other hand I can see a lot of "good matchmaking, you bad" acolytes only view the problem in a very narrow way, looking through their glasses. "The well-fed never understand the hungry". I don't judge how anybody got high rank, it can be definetely skill (is always a must, but can be insufficient), play experience (being in game for months, climbing mmr then) or even team mmr abuse.
Maybe it's just me, but If you look at guys who say matchmaking is ok, they are either team-queuers (if that is even a word) or had super high ranks already pre-matchmaking changes. Looking at top-ranking streamers they naturally tend to gravitate to team-queue even in pubs)