I think people may need an attack history so that they can keep track of who attacked and when. The heads up display doesn't help that much if you click retaliate and somehow dont end up at their compound. You might not be able to find the guy at the moment for numerous reasons and a result, can't "counter".
Great game... at least for the first hour or so. It gets a little grindy after that, but is still decent. I also agree about the multiplayer being necessary. Until then, 3.5/5