The short version: "Well worth the wait" doesn't even begin to cover it.

The longer version:
War in Heaven evoked emotion like no other campaign I've played. The way you guys set up seemingly hopeful events, then dashed them to the ground... tragic every time, but unbelievably well done. The events leading up to the arrival of the Imperiuse made it clear that the UEF force was doomed, but that didn't make it any more horrifying to see a GTVA destroyer emerge onto the scene. (Well, I say horrifying, but I was happy to see a Titan make an appearance since that's my favorite capship.

)
But the most powerful scene for me was, by far, the arrival of the second UEF frigate in "What Binds Us". By that point I had conditioned myself to expect GTVA surprises, and the whole mission I was expecting a Deimos or an Aeolus to appear and blast the Indus. To instead see another UEF ship enter the area and destroy the "first sane thing that's happened since the start of this war"... I was too shocked, too deflated to react. I couldn't bring myself to shoot at any of the GTVA ships and just watched my wingmen and the Indus take care of things.
On that note, I think one of the neatest things you guys did, as far as creating the atmosphere, was to portray the GTVA as a completely foreign enemy. As much as it stung to have to kill Xinny and Zero, to battle the 212th, and to attack the Carthage, these were all just constant reminders of how little these names meant to Noemi and the rest of the good guys. I went into it thinking the UEF warriors might be hoping for a peaceful resolution (like me), but everything that transpired made me realize how little the main characters would want that and how unlikely such a resolution would be even if they did.
Awesome as it was, I have to echo the complaints about lag throughout the campaign. People were mentioning 20-30 fps during Delenda Est... honestly, I would've been happy to get something like that over the 7-8 fps I was often playing through in that mission (which, granted, is in some part because I play on a laptop). In all honesty, I found myself playing more for the story and it was good enough to make me overlook the choppy gameplay, which I understand was mostly just a result of the ship models, but I know you guys worked just as hard to make the gameplay excellent and would like to experience that as it's meant to be.
Other than that, though, there wasn't much in the way of errors, though there was one weird issue I found in "One Perfect Moment"...
Just for fun, I decided to fly close to the surface of the Moon while on the way to the city. As I started to get kinda close, the city started to vanish, like a giant eraser was being dragged across from one side to the other (yeah I suck at explaining these things), and after the city had completely vanished I collided with something invisible. After I turned and flew up a few meters, the city was there again and there weren't any more problems. It doesn't seem like a terribly important issue, but figured it was worth mentioning.