Warhammer 40,000: Dawn of War is one of the GOATs, and in many ways represents one of the last hurrahs for the traditional base-building RTS. See, in the early '00s, the once glorious RTS genre was starting to show signs of wear and tear as it tried to adapt to a changing videogame landscape.
The shift away from the 2D RTS romps typified by the likes of C&C, Warcraft and Age of Empires was a rough one, and the era became littered with failed attempts to make a 3D hit. Dawn of War developer Relic, though, had everything under control.