On many occasions I've had pre-match ass. man. feedback telling me that a player is looking nervous and unsure and then on the very next line it says that the same player is looking cocky and overconfident. They also seem to have an unhealthy obsession with showing players onto their weaker foot and start gibbering about oceans of space if your defenders or strikers are more than a foot away from the midfielders.
In conclusion, the assistant manager feedback feature is a load of mince and is best ignored.