Great, but could've been better....
The missions themselves are an interesting variety of the normal Freespace missions, and you get to do "silence all rebels" sort of missions. They still tie them into the overall plot of Freespace quite well though, so they aren’t lacking.
On mission design, DESPITE what others have said, the last mission is possible. Hard, yes, but any self-respecting Freespace player can do it. I'm not ashamed to say that for my first try, I lowered the difficulty; though once you get then hang of it you can do harder difficulties. (Hint: try loading yourself with harbingers, and half the other pilot’s fighters. If you have them engage the enemy fighters and cover you, you're fine)
The team at volition also added a couple of new weapons and ships, and they're well balanced. The Zeus bomber in particular is nice.
So, why do I say it could've been better? The campaign needed a bit more length. The ending didn’t seem concrete, and it felt as if I should be going on to my next mission. Even just 2-3 more missions would've given it an OK ending.
Still, this is still a great expansion pack to an even greater game.
9.4( if they had included more missions, a 10