With more work they can be perfect
Log, I don't know if you will read this but what you have set out to do packs a lot of potential. I've been a StarCraft fan for years and I like that people are still devoting time to make spinoffs out of it. Here are some points you might want to consider for your next animantion:
1) Original StarCraft music: Self-explanatory, it creates a StarCraft-ese atmosphere that cannot be reached with anything else.
2) Louder explosions: when huge spaceships go boom they usually go big ;)
3) Wraiths in the SC cutscenes make a turbojet-like sound, which is cool. I know. realistically no sound can travel in space (no medium), but for the sake of pure SC, just add a jet scream sound for the Terran Wraiths.
4) Again, based on the SC original game cutscenes, the Wraiths attack with lasers instead of missiles (although their only air attack ingame is missiles). Maybe you could combine both! Avter all, modern fighter planes have both guns and missiles to shoot with.
5) Battlecruisers have multiple gun turrets. If you think about it, its is easy to make a gun turret shoot out to nowhere and keep it as stock footage (you can use it multiple times over for intense battles).
6) Blood and Splatter
That's all. The easiest and most effective improvement should be the sound/music sector; all the rest can fall in line later. I hope I helped you out and good luck on your next animation.
n00bster
7) Give it a more serious tone (humor every now and then is good though)