I always saw Vega as being a compitent squad mate but not that deep, not that interesting. Aside from the big problem that I have with the trailer that ill get to in a minute im just gonna throw this out there:
Why not make the movie about Thane?
He's a symapthetic, crowd favoured character with a good voice actor, interesting back story and because hes a biotic Drell he can do all the anime flying combat stuff that the kids find so cool these days.
Now onto the big thing:
THE MARINES IN THE VIDEO DO NOT LOOK, ACT OR FIGHT LIKE "WELL TRAINED SPECIAL FORCES"
I want you to pause the video at 0:21
Now compare these people with this image: http://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Navy_SEALs_in_Afghanistan_prior_to_Red_Wing.jpg/767px-Navy_SEALs_in_Afghanistan_prior_to_Red_Wing.jpg
As you can see the Navy SEAL's all look like well trained, well equiped, profesional soldiers (Also I would use the term "Scary Motherfuckers" to describe them)
Note how the guys from the Mass Effect anime all look like there first year college studens, with long hair, glasses (so they dont have corective surgery in the future?) and there stance is just irritating. I've already put way more time into this then I probably should have so let me conclude with this:
Having special forces training means that you will be physically more fit then the average soldier, it means you will have a deeper understanding of tactics and how to move and fight silently, it means that you will be an incredibly proficient gun fighter, which if you play Shepard as a soldier is pretty much exactly the above.
It does not mean that you can duel weild mass accelerator guns (depicted was having 0 recoil in the trailer, anyone who's played the game nows otherwise), flip around the environment like a ninja & survive explosions with you at the epicenter that take up half the screen.
Ow and there suits are inconsistent with how they are depicted as appearing in ME3
http://images1.wikia.nocookie.net/__cb20120319162127/masseffect/images/0/01/ME3_Captain_Riley.png
The TL
R version is that they got everything wrong, and that erks me.