Give them camo/ambush or some added utility. Maybe include an option to turn them into a better sort of pathfinder unit, very good at long range combat/camo ability (USF legit sniper counter

Rangers really add nothing over Riflemen play style, its extremely similar...just "better", Paras can be quite dissimilar to rifles and elite units should not just be about having a "better" unit but one that opens up different play styles and tactics.
How can people complain that adding versatility to Rangers would be too much when you look at the 8 million things you can do with falls, obers, jaegers, pgrens, etc.