I'm not convinced the Beginner Matches are even helping beginners.
There are those like the OP that instinctively understand the game, and go on a stompfest wondering where the "real" game is. And there are those that don't pick up the game instantly and are left floundering because they're surrounded by other newbs and there's no one to tell them how to play the game.
Over the last week or so, I've played with or against a lot of new players in the main game (summer holiday influx). Far too often I've heard them say that they're planning on giving up because they don't understand the game, they've been on a losing streak since they started. Or, thanks are posted to experienced Captains who've had them on their crew in the post-match lobby because for the first time they've had someone tell them what they need to do. Really simple stuff, like aim for the hull with a gatling, hold fire with the flak until the targets armour goes down, etc. They get their first win or first win streak.
If quick join is matchmaking entire lobbies of sub-L3 players, and I was amazed how many beginner lobbies there are, then the game is going to lose a lot of them because they're going to flounder and no one is going to notice. There's no one on any crew they join who knows what they're doing, no one to coordinate or instruct them. They get stomped by Kuratias and player like him again and again, until they give up and go play whatever is the Steam deal of the day.