I haven't finished SP yet, i'm on the NY mission with the Speznas around the Statue of Liberty, but that 30 second cut scene to open this mission up was worth paying for this game. How amazing was that? Holy shit, that Audioslave song went great with it.
http://www.gametrailers.com/player/23744.html
I like controlling just 10-15 units. Easier to move around. When playing games like Total War, there were always units standing around or getting their asses handed to them because I couldn't be everywhere at once.