If they were really "all about the single player", they'd have a Risk-like or TW-like FFA campaign like Dark Crusade.
I'm thinking about not even buying DoW4 simply because I don't want a big story heavy campaign where oh no Cyrus dies, Gorgutz does the thing, or whatever is going on with the Necrons. I want to make my own fun. I don't want to be told what is happening at all times.