I'll pass. I never liked playing RTS games multiplayer.
1) If you're playing with someone better, you get your ass kicked, and you don't know why. Case in point: My first game of C&C '95 multiplayer: I'm building things, and like 30 seconds into the game (or something absurd) a chinook shows up, a commando gets out and blows my base to pieces.
2) It takes too god damned long to actually learn to be better, since each game can take so long. In FPS games, playing it is a dynamic learning experience. In an RTS game, you only figure out why you're losing after you lose a certain way 50 billion times :p
3) If you're losing, it's no fun. At least in FPS games you can run from the onos and dive headfirst into a pit.