Been playing for a few weeks now. In the beta you can play against ridiculously easy computer or super hard net kiddy players. If there is a sneaky way to cheese a game with an early rush, a proxy base, a back way into your base, they will find it and use it every time.
If you survive that you can look forward to the same kind of attempts on your every expansion. But so far I like that I've never seen any match go to who's got the biggest fleet of BattleCruisers/Carriers. Early rushes can be very unit centric but mid to late game the non-diverse army normally gets routed. It's kinda nostalgic going back to resource gathering/expansion defending/tank creeping after all that time playing Dawn of War/Company of Heroes type games.
But I'm mainly in this to see where the story goes.