Some press sites are saying that the campaign is accessible enough that anyone can enjoy it. Do you agree?
Absolutely. There are Tutorials to start out the uninitiated. Then there an Easy mode campaign followed by Normal/Hard/Brutal. Then they can foray into the Challenge modes which teaches the user the strengths and weaknesses of the units to help prepare them for multiplayer. Then of course there is vs. AI, Coop vs. AI and then PvP games.
So yes the single player campaign is accessible enough for a new player. And the difficulty can be changed at any time, mission to mission.