Yawn, this thread turned into the same thread every other RTS thread turns into. Starcraft is the best and here's why with a bunch of buzz words like balance and posting of Korean 'pro' videos.
It just goes to show you, Starcraft will always be deemed the 'best' because it was the 'most popular'. Even if a new RTS comes out that does have better 'balance' and 'gameplay' (which I feel, multiple have). And Starcraft 2 is being set up for the biggest case of sequel effect in history.