I consider the maxim, like all allied machine guns, garbage.
Sure only 3 best mgs in the gamebare from Allied side.
Maxim is usually not recrewed cause its a huge difference to have 4 or 6 man maxim.
Its 100% worth it specially when u have ambu/Brit reinforce point/HT or any kind of heal on your side
Just dont be a <> a do not sit back and be active specially in as you say 3v3s because there is a lot of space on many maps and its useless to have 2-3 maxims just siting somewhere and doing nothing.
This mg is supposed to be used as assault mg so use it with cons. who can merge if u lose some models or be your scouts for maxims. Then all u need to do is press Q hotkey and attack.
Do some guards as protection against armor.
Overall everybody who says maxim is shjit and mg OP shouls try to play tourney or high-high (not high ranked game sith epic 48% wn players) against USF+Soviet combo.