Fixing the "Fearless"-rule and the extra wounds it creates when in CC would go long way to make a viable horde-army again. Right now there is no reason to charge with Gaunts cause they will be beaten in CC and most likely half the brood will be wiped. With only two viable troop-choices (Hormagaunts are overpriced to their performance) 'Nid are better of hiding in cover and shooting than getting up, close and personal.... unless you run stealers of course which makes holding objectives tricky (too costly and brittle to be able to hold objectives)