in the last two weeks I've lost using the 4-4-2 narrow diamond and the 4-5-1 V vs inferior teams using 4-4-2.
Today I played a guy who used 4-3-3. He was of course not watching the game and in the beginning his MC gets injured badly. His team was also a lot worse than mine; his best player was 5 star less than my best.

I use 4-1-4-1 that usually works pretty well against the 4-3-3. But in this game he won with 5-0 and absolutely dominated the game in terms of chances, despite me having 55-60% possession. Simply amazing.

It seems obvious to me that Nordeus have tweaked the game-engine so that proven counter-formations dont work anymore. This is pretty bad imo and I dont really get why they felt the need to change something that was already working. Right now, it's just way too random.