The Imperial Guard is a super fun faction to play, and the opportunity to play as factions that are actually interesting (read: not the space marines) in the campaign is a big improvement over the base game, but the design in some of these missions is absolutely atrocious. I don't know who was smoking what when the decision was made to design Order Mission 4 around defending an AI-controlled vehicle that insists on driving itself into infinitely respawning enemy anti-vehicle units. I don't know whose idea it was to have your only recourse be a button on your commander you mash thirty times a second to say "PLEASE STOP DRIVING INTO LANDMINES, THANK YOU" until you can spam enough units to push through an infinite number of chaos horrors and heavy turrets, but it was probably the same guy who also thought it was a good idea to disable base building in the same mission.

Played for a few hours and immediately moved on to Dark Crusade. Didn't look back.