Like in any Co-Op game, you're only as good as your Economy and for Raynor, having 2-3 Orbital Commands(if not more) is recommended. Artanis can use the vision granted by Raynor's troops to deploy his power field from which to warp in troops(from which both forces can attack and overwhelm an area quickly) while Kerrigan can use the vision to spawn an Omega worm(special variant of Nydus worm) so that her forces can pop out and support Raynor's forces and then both can use the worm to move to a different location. This ability works rather well with any Commander but none more so than Artanis and Kerrigan(the other two Commanders that can be played for free). Raynor's Strength is the ability to Attack from anywhere since his forces can drop in via drop pod without the need of vision(requires a level 12 Raynor to do this). Raynor: Raynor is the commander that is available to everyone, even those with the starter edition(hence he's free to play). As such I figured I'd divulge my strategies and tips for anyone playing this game mode as a Terran Commander. The one faction I play more than anything is Terran and presently there are only 3 Terran Commanders(suggesting that a new one may be on the Horizon soon).

Rather it's kind of like a custom campaign with a partner.

CO-OP is nothing like Ladder or multiplayer.

Starcraft 2 how to play terran