CoH is a reaction speed game, testing micromanagement etc, MoW tests your stratgey and tactics and punishes you so hard if you do something wrong.
Its so much better than CoH, and it has coop. I have only played 2 missions of the single player but I'm madly addicted to the multiplayer. It may take a while to get used to online as you get thrashed again and again, but stick with it and you will think its the best RTS ever.