The greatest RTS ever...

[bojangles1987]

How are people arguing against Age of Empires or Starcraft?

Company of Heroes was pretty badass too.

[Pactar∂]

Age of Empires 2 is definitely one of the best RTS ever created. Simple awsome through and through. My second best would be Warcraft 3. Both with great multiplayer, and nicely moddable.

[Smokin'J]

Red Alert 2 is where its at

[???]

Age of Mythology > Age of Empires 2.

[Mr. Fantastic]

The first Starcraft.

If you can classify Rome Total War as one, then that gives Starcraft a run for its money. My 2c.