1) Description - You promise to put a proper description, hence I won't comment anything about description at this moment.
2) Terrain - Very poor, the forest just consists of 1 type of tree with same varient, similiar size and height. Forest does not consists of a tree only, you did not even use fog and this make the edge of the map could be seen just like this image below.
From what I seen, you even use blizzard cliff and you use it at rather ugly way as well. You use size 1 to form a cliff? It make it look like (ahem* ahem*), a big banana standing still instead of a cliff. Blizzard cliff are not suitable to make a hill/mountain but rather a canyon.
Also, where the hell did the water come out?
The arena was ugly and doesn't even look like a arena at all and all those tree around the arena area look like they been stack neat and organize just like a book in a library.
Also, how the hell did the arena just full of female audience? Where is male? They all look like they are wearing same clothes as well.
3) Camera - Very bad, 90% of the time it keep run through destructible/doodad and even the cliff (Especially the beginning of the cinematic). When it move, the movement was choppy as well.
4) Animation - Very poor. The only animation I could seen was the King keep holding his hammer upon the sky and the rest does not even have proper animation when spell casting and attacking, it was usually standing like a dummy all the time.
5) Sound & Sound Effect - Very bad, it would turn off music everytime it was activate. Some particular sound does not even match with unit conversation and contain static.
6) Music - Bad selection of music, it doesn't suit the theme of the cinematic and the music goes off whenever a sound effect activate.
7) Special Effect - Special effect has been overuse, it seems to be nothing but a spam of special effect.
8) Replayability - Extremely low, the camera always stay lock and hardly move. When it start to move, it was choppy and keep running through wall. When it sway, it sway soo hard as it was like an earthquake with magnitude of 9.5 and this make the entire cinematic hard to be view.
The battle scene have overuse special effect and no proper animation. When those unit cast spell, they just stand there like a bunch of retarded or moron that does nothing.
The battle scene contain a waiting syndrome as well. Let me ask you this question, "If a wolf start attacking you, would you stand still like a idiot?". The answer sure is NO, the same goes to the character in the cinematic as well.
If the wolf start attacking, Ryan just stand still like a dummy waiting to be tackle by it. With the speed of the wolf teleporting, Ryan could have easily dodge the attack.
The same goes to the zerg as well, they are just standing still waiting for it to be hack to death. The battle was repetitive with the same overuse sfx without any proper animation. It get borings after watching the second round of the battle; audience would probably quit this cinematic even before they watch the finale battle.
9) Scripting/Triggering - Very poor, some special effect just remain at the cinematic all the time. From what I view in this cinematic, I knew your scripting/triggering have been set at the wrong way with the lack of basic cinematic setup.
You are using play music instead of play sound for sound effect and you are using wait instead of precise timing for battle cinematic.
10) Typo Error - Plenty of typo error as you can view from this screenshot below.
1/5 (Unacceptable)
You need to polish it if you wish for it to be approve, it contain lot's of sfx abuse, typo error, bad camera movement, no proper music/sound, waiting syndrome and poor terrain.