As for "no such thing as ranged advantage" - yes there is, and it can be capitalized upon.
Please do explain. I am all ears
I hope you are not just talking about your sniper; the one class that has effective counters to Mele. You can't rule out Marauder abilities just because there is one class that can counter them. There is only one ability in the game that doesn't have a counter: and that's Undying Rage. Note that it's the mechanic of COVER/ENTRENCH and the snipers own defensive abilities/Knockback that give him the advantage NOT the fact that his attacks are 30m.
The sniper I believe is another class with a very full tool-box, but IMO is not as powerful as a marauder.