So who has completed the campaign?

[cheGEVara]

Just completed campaign. Finished Level 10 by overrunning the Factory with a GEV, so didn't observe any problems there. Level 10 is not hard with an all-GEV attack. If the Ogre's don't block you, you can race in close enough to the broadcast tower to kill it, and once you have your 4 Ogres, it is pretty easy to overwhelm the defense. Especially with judicious use of your Mark IV missiles or remaining GEVs to rush in and take out howitzers. In the beginning, 3 GEVs are generally enough to rush and take out a howitzer. The howitzer will get one of them, but the other 2 can generally disable or finish it off in 1-2 turns, while staying out of range of the next furthest one.