Okay, some feedback...
1.) Only a few events, kinda boring.
2.) Delta wing is supposed to be a reinforcement, but they come in whether or not you call 'em. You forgot to set 'em as a reinforcement, but to be honest, you don't need them at all. Makes it too easy.
3.) The Corvette should start facing the node. Also, during the mission, it kinda...goes stupid. It flys in a crazy pattern, and then...meh. Try messing with the waypoints.
4.) No delay between enemy waves. Kinda hokey looking, and seeing as there's only one wing of allied bombers, you get cut down quickly.
5.) What's with the cruiser? And the message that goes "why would a corvette need a cruiser as an escort?" Needs work.
6.) Not sure if beams are enabled.
7.) One one nebula is visible, and it's a tiny little square. Backgrounds, dude, backgrounds!
8.) Too easy if you manage to take down the Lokis.
9.) Again, look at the retail Fs2 briefings. They don't spin around like yours do. You don't need to twirl the screen around when you could just leave it stationary and move the icons.
Keep at it, and spend some time testing, future-FREDer. Some improvements I did notice....
1.) Good use of the 3d-plane, although some units still have questionable starting positions. Big improvement, I think.
2.) Mission dialog has improved. Good job.
3.) Objectives function correctly, as far as I can tell.
4.) Quit as soon as I killed the cruiser and corvette, so I couldn't tell you about the briefing. I assume you have one, though.
5.) You seem to have waypoints down, although they need tweaking. Good work!
6.) Generally, although you have a few things to iron out, you're learning. And that's what matters. Keep at it!