Ill start right off with a review on your cinematic,
General:
A decent cinematic, overall I'd have to say that you are well in control of what you are trying to show the viewer, which is a good thing.
A little pointer which isn't going to fit any of the below sections, you've made a very smooth start on your cinematic, but the floating text comes in rather sudden, and disappears just like that, try to work with fade ins and outs on floating text for a more smooth touch, which you are trying to give the viewer.
Terrain and Environment:
I like your introduction with the dessert touch, you didn't place any unnecessary doodads, for a dessert doesn't really need one, and the fog + sky basically completed the scene you were setting.
Once entered inside, there was one remarkable thing I spotted, black water or fog, which was a bit of an eye sore when you applied the top camera.
Try to either fill it up or use a different camera angle.
I'd have to compliment your room designs tho, the tomb feeling was well transferred.
Camera Motion and Control:
Eventho you commonly used slow pans; your angles, speeds, distances were pretty well placed.
Try to vary the distances following the acolyte tho, for example over the shoulder look can be a nice variation.
One big pointer is, when you tried to pan outside the pyramid; it did completely mismatch the sound, the sound felt epic and the pan rather blunt.
Story and Characther Build:
I will not get too deep into this, seeing it was an intro, I like the fact you are trying to implement something with myths, it has been done before, but as far as I know (having watched around 400 cinematics) this hasn't been illustrated before on the level you did.
Animation and Interaction:
The Acolyte's Walking animation was quite alight, the hover is just fine in my opinion.
A point that you should take in account is the moment seth awakes, the scene is a bit too long for my feeling, however, if you are going to use the sounds you used, try to make seths animation accordingly, so give him 2 long animations instead of a dozen short ones, it makes him rather twitchy compared to the sounds, and almost gave me the feeling he is some sort strange creature that just awoke from a box of drugs.
Music and Audio:
You started off nice with the slow music and the fire sounds of the somewhat "torches" that lit.
Your summon sounds didn't match, the creation of fire could have used a better loop sound as well.
The music you used when seth was about to awake switches twice if I am not mistaken, but the switches felt rather abrupt.
The music and SFX use is something you should take into serious account, cause it gives allot of emotional scene setting to the viewer.
Overall I'll give rate you with a 4, a job well done, but room for improvement.