I wanted to give some clear feedback from a perspective of someone who usually plays with friends only.
Playing alone has improved quite a bit in terms of matchmaking responsiveness, but still takes some time and most often disconnects from the lobby.
Playing with a group of 2 or more is still not working and the lobby system is still broken-it boots your friends out of the lobby if you cancel a matchmaking search and we have to “Quit” MCC and restart the game for us to reconnect to each other. Voice chat is still slow to start up as well.