The promethian sniper is a 1hit KO anywhere on the body. However it has a distinguishing laser that the opponent can see. The mantis can trample most opposition, having a charged rocket blast, stomp attack and turret, its armor seems very tough too. However, it has a close camera so sneaking can be hard to detect and power weapons will take it out in 2 hits, except the promethian launcher, which has a 1hit KO efficiency. By January, players will either find a way to combat OP stuff or will be using it. If anything, I would assume they will nerf it by news years, that way, it can efficiently be declared OP. Since this game is new, its gonna require adjusting to weapons for many players.