Few things that made it seem wrong
First of all, its obvious you've never spent much time playing StarCraft, because theres so many errors the way the units acted. For one hydrolisks shoot spines outta their shoulders(as said in the books) and if they struck a marine, they wouldnt blow a hunge chunk away, just stick in and burn from the acid. The battles sucked (if u can call em that) because those united can take more hit then that ( a ling killing a siege tank in 3 hits?) Also a Gardian cant attack air, so theres no was they could of destroyed the Command center (you would need a devourer to do that).
But on the animation, ok, try animating their legs, give them life, give the ghost more detail (he looks like he's wearing a cheap holloween costume) add backround music and more SFX. Make the battles a little longer and I think you may have a winner on your hands.