The matchmaking design choices are comically counter-intuitive. If it finds you a match, then the room gets filled, you are given an error message stating the room is full, and are bumped back to the main menu. This means you are forced to manually requeue.
Match selection is done in groupings of modes, so when you queue you are queuing for both. You can put a preference on for one over the other, but it usually ignores it. Which is obnoxious since it doesn't tell you which mode you entered until character select. Meaning if your goal is to complete a daily quest, the earliest you can leave is a few minutes later, after everyone has loaded into a now active game.
Then the 4v4 modes allow for gear stats that boost your abilities. The way this mode is intended to work is to balance out the item levels between the teams. How it usually works is one team with end gear vs the peasantry, usually ending as expected.
Among other things, one of the daily goals has its alphabet to change to Cyrillic every time you log.