With reliance on infantry and no speed boost like with Holy Roman, its likely the lowest winning civ in team games of every civ, not just the new ones.
And very easy in the late game to build counters against. Once their army dies, its usually game over since it costs twice as much to replace
While we don’t have stats for ranked team games, in qiuck match 4v4 they are above average with an above 50% winrate. The total cost of the full army is about equal to other civs. Even though their units cost double, they only build half as many as other civs.
Also if you are using MAA as OOTD you are probably playing them wrong.
They probably are pretty decent in teamgames/imp. The dragon handcannons are actually ridiculous units, .5 extra range and double the hp/dps