Team matchmaker would be better if it had more people in it. You wouldn't notice the lack of creature comforts if it was one game after another as it was shortly after Steam release. I certainly don't recall any complaints about the fact that MM was just "push button, play game." It was probably a selling point. "Push button" is an easier process than go to custom tab, find the right game and wait.
As it stands, I spend much of my time watching lobster pots, then jumping in when I'd rather be playing small teams because there are no small team games to be had. Sure I could set up a custom room, but who will peel themselves away from the latest crustaceon meme?
Maybe we should just ditch the matchmaker system full stop for team games and have it as a 1v1 queue only (since 1v1 scene is still reasonably lively, though the amount of times I've run into [ffc]
there has got a bit silly!) Set up 2v2 and 3v3 autohosts and just run from there. I don't think there is a need for a 4v4 autohost since that size of game was rare anyway and when MM decided to run a 4v4 on Living Lands, it was just taking the piss (essentially a lobster pot writ small).
Small team rooms with all the custom panoply will supply the community benefits Steel_Blue
proposes with little effort and being able to see who else is in the room means we can assess for ourselves how fair the game will be, eliminating immediately the premade problem I've complained about in the past. When there are newbies in the rooms, more experienced players could also speak to them in advance. A friendly introduction beforehand will probably make a better initial experience than joining a blind queue, getting raged at for not knowing how to play and then being stomped by the other side with barely a gg for your trouble.
Since there are so few people doing team MM these days, I don't think an extra channel would really serve any purpose.
Buttons could be added for "join 2v2" and "join 3v3" from the menu to make them easy to find if desired.