ya the meta game for RTSs when they first come out are insane. When SC1 first came out terran was just "rush to cloaked wraiths" because so many people neglected detection.
In war 3, NE players would mass hunts. Orc v Orc was mass kodos like you said, mass casters were used tons of times too (especially human casters with poly + inner fire). Mass necromancers used to own because only humans had dispel for a while.
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Currently playing: SC2, Civ 5
Next up: eh ; Awaiting: meh