gyokzoli: It's a very good game, well worth this price. Just to tempt you more. :P
johnki: Contrary to this opinion, I didn't like it. It just didn't quite feel right to me.
Though I never realized it had a co-op campaign. That's pretty awesome.
Tried to play the co-op campaign in Retribution, and it was not fun. It is the single player campaign, but you split the available units between the players, which means that each individual player gets very few units to play with.
DoW 2 is a multiplayer game. The campaign was a bit lackluster (far too repetitive & easy, even on the harder difficulties), but when playing with/against friends, it is quite fun.