Thanks for the advices, @Reformed_Maniac.
Anyway I stopped playing in teams, even a bad experience out of four or five is too much for me. After all, is simply a game and I look to relax and have fun for a while. I'll keep that in mind if I go back again, though.

@Berenjena_Mortal
1) No, you should not decide who to attack as soon as the game starts. I think teams mode in 4 player is very volatile. You need to act upon the immediate situations, Yes, you can decide to attack a player if you see weaknesses in their position.
2) As for players under 1400, I feel the biggest issue is not communication, it is their willingness to learn or not learn that decides the course of the game.
The easiest way to climb and reach 1800+ is to know the opening theory, there is basically one main line that has been tested and developed as of now. Other lines and variations will follow later on as the game develops. You should follow the theory because most < 1400 rated players get mated very early on in the game because they dont know the basic traps. If you wish to create theory, you should practice on open 4 player board and spend time to find a working novelty in a main line.