I finished that mission just yesterday. And became really pissed when i found it was the end of the campaign...
I made it in medium difficulty. I found that the best way to pass it is to forget about the station and the Hades, and focus on the fighters. Protect your bombers, they are vital. I managed to destroy the station just when Hades was jumping in. Then i told the bombers to kill it, and i placed myself near the fighterbay, waiting for the Lokis comming out. It was easy. Really important too, is to save the cruiser. When the cavalry jumps in, a squad of bombers launches from the Hades to kill it. Take them out. If you follow the game´s auto-targeting, you will only kill Lokis. Look for bombers once in a while, because they kill the cruiser in just a few seconds. If you save the cruiser, he will place himself above the Hades fighterbay, and rain fire on them as they come out!
I used a bomber at first, and kept loosing. Then i changed for the Valkyrie, and it all runned smoothlly!
My score in that mission was 49 kills!