Games without antialiasing controls irk me. I'm looking at you, Dawn of War. I'll let it slide this time, though, because you are so, so pretty.
Speaking of Dawn of War, the Dawn of War website says that the expansion pack Winter Assault is the first RTS expansion to include a fully-realized new side. I assume that they're jabbing at Warcraft III: The Frozen Throne here; the Naga were not playable by themselves in that expansion though they were playable in many of the campaign missions. But, their memory is very short. As I started listing off moderately recent real-time strategy game expansions in my head, they were wrong by the first one: Command and Conquer Generals: Zero Hour, no new side; Warcraft III: The Frozen Throne, Naga not "fully realized"; Command and Conquer: Yuri's Revenge... oops! Yuri's Revenge featured an all-new side that was completely playable in multiplayer, Yuri's own faction.