First of all: I never liked the mortal combat stuff, includes the music. But this nothing against you or your cinematic, so I try to be neutral.
You should change the camera, that the camera isn't showing everything under the ground.
I don't like the part with the dragon. The Blademaster just switch into the dragon, a really low "hit animation" from the dragon and the Archer was dead. This can be more I think.
The part when the dude - model: Arthas - comes. This take to much time, while he channel (I think he do this) this powerful ability. But I think also this was needed, of the cinematic was to short for the music.
The cow was funny and make me laughing, that's no question.
The spell using and the effects are cool, wondering about the whirlwind and how he knock back her arrows. It the arrows would be shoot on this tale not on his feet, would be perfect. The rest is ok.
Ok what we got:
+ Was a nice battle.
+ For your first cinematic ( I trust you in this case^^), it was cool.
+ The cow is funny and a nice laughing effect.
* Some effects can be better.
* The part with the "Arthas dude" is somehow to long.
* A golem and blood - maybe some better thinking
* Not easy not hard to create.
- Don't like Mortal Combat at all, but this nothing against the cinematic
It's 3/4/1 - actually it's 3/4/0. Also the neutral points are "weak points somehow" so it can be "3/2/0" The neutral points are nothing bad thing. So I think, I will give you 4/5!
End: If this was your first cinematic and you plan to create more - there will be create!