But yes if you don't play a lot of RTS games it's probably not worth buying it yet, but that applies to every genre.
Exactly, why should I buy it for full price if this is not my favourite genre? I can wait until it is cheaper or even longer and I will get all campaigns in one bundle pack.
It would be exactly the other way around when Rage from id will be available. I will probably buy it instantly no matter what price. But this happens rarely to me.