Never tried my new Harrier X on him since it was at level IV. Think I'll give it a spin today. 
Otherwise, if I see a Ghost with a high enough leveled Harrier, it must mean he should be good enough to do without that kind of cheese? Though sadly I can be wrong with this too quite often, I just don't always take that chance and bail on these lobbies sometimes. Cause even if someone is a very terrible player, seeing them with this kit and not learning at all, but using stuff like left hand advantage and a fistful of stimpacks, just makes me cringe a little too much for my liking.
Though I still play with plenty of Ghost Harrier players, cause, well, they are everywhere.
I love him for Gold runs, one of the better kits to handle leechers
No, I've handled leechers with much worse setups, and succeeded as a team too. That's how you handle leechers, but making them learn how to play as a team and earning their own credits. Not you Ramboing everything for them with one of the cheapest setups in ME3mp. Go solo if you want that.