That was... pretty two sided...
Overall, it was great... but something really seemed odd in it. The animation in some parts of the movie looked very... OMGZ F1SHT FL4ZZ MuWAY! -ish... but in some parts, it was pure 10... the marines and missile turrents really bugged me; i was thinking 5 or so in those scenes. But the Mutalisk animation was just plain awesome! If you had put the same effort into the other parts of the movie, this would've definetly scored 10.
Also, the sounds is great; in whatever places there is sound... There are some awkward soundless breaks, where a little background noise would be nice... But what sounds where in were well placed, and of excellent quality, while still keeping file size decent.
I really liked the attention to detail, such as the armory. Definetly a pluss.
You've definetly improved since the other flash movies, and i'll probably be looking back later to see if this continues... (still 7 terran missions i believe... hope you'll make the zerg and protoss campaigns as well.)
Overall; 8, but very close to 9. A few more details here and there, and this the next one is sure to be a 4+ on score.