Please don’t allow 4 of any class to play together in random queue.
Played a game with 4 Psykers and it was absolutely silly as we all tried to BB and shoot our staffs at the same time. Psyker plays a very specific “role” and outside that role they have extreme weaknesses especially due to some BB and Talent issues. So you throw 4 Psykers together randomly who are basically built all the same(as if there were choices) and used to playing the same role in a group it just does not work. Lots of CC, lots of horde clear, no quick DPS, no quick elite/special kills, the same short range F, locked down force sword animations, low health, etc etc etc.
Imagine 4 BW Sienna’s in the same match…it would either be absolutely OP or hilariously sad as they got slaughtered depending on the difficulty played.