I always tend to think in rpgs what gender seems to fit the kind of a playthrough I'm going for. For some reason if I do something like wood elf ranger it would def be a female. Bulky warrior with a 2h axe? Guy. 1h shield paladin who smites the unjust? Guy. Someone with keen knowledge of the arcane that freezes everything? Female. Cloak and dagger assassin? Female. Pyromancer? Guy. Witch? Female.
Sometimes I mix things up, like the paladin one. And sure, I also take personality into account which can switch it up.
Haven't played mass effect so no idea about rhe "classes" in it.
Now, if the training was the problem, then it is negligence of the person in charge of team (or whomever gives the ok for them to work in that job) and they should be held accountable. But not their boss(es) too.