You took the words out of my mouth, bish xDStarcraft: Broodwar
Stronghold: Warchest
Age of empires 1 & 2
Yeah, well, it's partly your fault too. You named the thread "Best popular online game", when it should have been "Best popular online RTS".O_O, read the post...
unless they just converted WoW into a rts, you posted blindly