I have never played any RTS game before but it took me not all too long to figure out how this part of the game works in DC. So, I don't think that you should be afraid that the game would be too complex for a light touch strategy fan^^. You can slow down the pace of the battles and also adjust the difficulty settings (or even do autoresolve^^).
So far, no single-player campaign had been added to the beta. But from what I have heard and seen it should have a deep and long story. Take a look on some Let's play videos on youtube from the press beta (they had the first chapter of the game or so).^^
