So I just finished going through the campaign like 203472 times because I was editing the grammar and stuff so I figured I'd post my thoughts. Overall it was very very good. I liked the lack of briefings, especially b/w missions where you are sposed to be going straight from battle to battle its a lot more realistic. And the use of cutscenes and things for story telling is a nice departure from the rest of fs. Reminds me of Half life. New music and new couple of sfx were cool. Music was especially fitting. Since you are using messages to convey so much story, they're going to be longish. Make the especially long ones display longer (is that possible?) or split them up sentence by sentence. Otherwise you're struggling to read things instead of playin the game.
As NGTMR1 said the loadouts and ship selection, at least before acquiring supplies from the outpost are pretty crazy. After you get the old stuff from the outpost and you've set up the situation that you are going to be using old tech you can do as you please, but in the beginning when you should be fresh off the front lines you should have much more up to date weaponry and ships.
Missions with the outpost is pretty damn long. 17 or 18 minutes if i remember correctly. Between the last two missions, if you switch b/w an athena and valkyrie it suggests that you've been back to base. If that was the case there should be a briefing i think. While the lack of briefings is nice, i think they should be mixed with briefings. It will allow you to beef up the story content, which was a little confusing/had some holes. Both the destroyers did not put up any fight at all. Made the last cap ship battles pretty boring. Fun to watch, but they shoulda fought back. The whole outpost going critical and everyone being fried with the heartbeat and then all that was mad cool.
Overall a good campaign. New way of telling the story, plus some new "events" or w/e you wanna call em makes this pretty special.