Goblins aren't as cost effective as they should be (IMO vs lore and tabletop)
Maybe they should have a -50 cost reduction?
As in common goblins cost 250, night goblins cost 350?
Also, I don't see why there isn't a vanilla common goblin unit (handweapons) and one with spears that actually is anti-large. Many units from other factions (Bretonnian men at arms, clanrats, Saurus warriors, skeletons) have both handweapon and spear variants like in TT, but goblins (which have both variants in TT) have only one type in total war.