The engaging multiplayer mode should help add some important long-term value to a single-player campaign that probably won't merit more than a single playthrough. But in the four hours or so I spent working through the single player preview build (which I was told represents about one quarter of the game), I felt like I had barely scratched the surface as far as tactical and upgrade options. I can't wait to see what the rest of the game holds, even if I'm not sure that I can handle seeing another one of my units die an untimely death.