I feel like matchmaking for premades doesn't take into account premades that are made up of 5 friends that just happen to have ended up in a 5-man. It seems to assume we'll always be on comms or something, not the fact that we just like playing together.
Sure, we often have an elo imbalance, but when everyone gets rekt, not just the lowbie, you get a bit down.
14 games, 14 losses. 14 tries at having fun with a bunch of friends, 14 miffing experiences.