Games in solo queue QM where everyone seems to know the game are down to about 1 out of 5 since open beta, which I find weird since keys were so easy to find. Maybe it's the mental barrier of needing a code for access that stopped people. I assume the same barrier should exist for beta. For example when hearthstone was launched as someone who didn't play the beta I remember thinking "Oh, I guess I should check that game out now..."
So I expect it should get worse next week, hurray!
My team with two new players almost won a game against a team that clearly knew what they were doing and got 100% of the tributes, just last night. At first we had two people pushing bot during tribute and I asked them nicely to help us get tribute. No reply. Later same old thing instead of raging I just asked if everyone was a new player. One of them responded it was his 2nd game. It was obvious by that point he wasn't clearly connecting the mini map/ping sounds/on screen messages quite yet, so I didn't even bother talking the rest of the match.
Almost winning in that scenario felt better than actually winning does most of the time.