That's the point, if they are able to leap that means ur in their death range:) what i mostly try to mean is that they are dangerous true that but also avoidable or killable. When im playing with my commando i avoid to distract them and attack mostly when they are busy with another one. But when im playing with my sin i sneak to them and attack without fear.
Brifely I don't think they are OP, they are just what they are meant to be -close combat experts-.