OP Legio or why do you need MP?

[Akanamah]

 i can see the Legionaire being a less likely pick for most players.

if this is true, why, when entering the game, I see that the legionnaire is the most popular of the 16 classes, regardless of whether the player is rich or not.
besides, if he is not an OP, why are legionnaires almost all at the top of the killings? Is it because, unlike MP, they can play much more aggressively, having more armor and green HP. while MP is forced to pray so as not to die from one hit into body (on rag) and he die from 1 headshot on hard (with better helm (BH Barbutte) ranger - 65%+ chance die sniper ~80% - other 99-100.