You must of not ever played warcraft 3 its simply the best rts game for years untill sc2 and coming of DOTA 2 recently kinda half

the community.
Heroes in wc3 basically did their job right and in custom maps even better they still take damage maybe not as easily as footman do but they do take alot of damage they have some heals but eh in TW u cant heal an army up or a single unit because it'll be pointless, but Heroes did have Auras and thats how u get your advantage weather the aura helps ur armour levels/health regen/strength it helped.