The story of the real life Roman General Corbulo himself: A valiant warrior hero whose suicide at the Emperor's command represents ultimate loyalty (as General Black would have everyone believe), or a tragic victim of corrupt politics and Emperor Nero's paranoia?
In-Universe: Lasky views himself as a conscientious objector. The others view him as a cadet who is refusing to acknowledge his duty.
Critical Research Failure: The script writers clearly didn't understand how an actual Military Academy works. General Black's constant involvement with and treatment of a group of freshmen cadets is the most egregious example. Colonel Mehaffy's (non) reaction to the fight is a close second since fighting between students is considered a serious offense, and is often grounds for suspension or dismissal.
Uncanny Valley: Spartans without their helmets fall into this. This was likely intentional, since they've been trained and augmented so far beyond human potential. This comprises having faces too-youthful for their size (the youthful faces are right for their age, the size of the bodies on which those faces rest is what is unnatural), too-pale skin (from having spent most of their time in armor), and otherworldly eyes (due to their ocular augmentations.)
Visual Effects of Awesome: For a web series, it has really good special effects with weapons and the Covenant. Microsoft really put a lot of money into Halo 4, and the marketing budget had to go big too. Understandably, Forward Unto Dawn got a lot of good backing driving those effects.