I think a lot of the points raised by that article apply to online gaming in general, as well as RTSs. I've never played Starcraft to any kind of competitive level, but I used to follow it in CS, and it always succeeded over other shooters for very similar reasons.
For developers to make a properly successful multiplayer game, I think they need to learn to scale back their desire for amazing graphics, and prioritise far more towards a clean, responsive engine. I don't think it even neccesarily has to look bad, just not have effects that either slow the game down, or obstruct your view.