While Nightfall is a step above most other video game televisions or film adaptations, it is still unfortunately delivers less than what is expected from a modern drama and quite honestly less than what fans of the long running game series deserve. Halo obviously had an incredible series of video game entries but also was really the first game series to pioneer a literary universe alongside it with many award winning sci-fi novels that routinely place in the New York times best seller list. Television and film is an arena Halo has yet to conquer as successfully and Nightfall is, sadly, not going to change that.
My biggest complaint would be that at the end of the day the story really has very little to do with Halo. That's a benefit for those watching who have never played Halo, but a letdown for those fans looking for that kind of story, and honestly considering the scope and quality of what is available for sci-fi why would you watch this if you were not a Halo fan? Most elements here, if you had simply swapped the names to non-Halo terms, would not change the context or value of the plot at all. It is a sci-fi film with Halo paint essentially.
The CGI is absolutely laughable, but the costumes are quite exceptional and really the CGI turns out to be very limited as this turns into more of a character drama than anything else which I enjoyed. Most of the characters are fleshed out with unique motivations and it creates a lot of loaded, tense conflicts between then as they decide what they have to do and what choices need to be made. If I can say one thing is that this is the realest Halo had ever felt in terms of characters and motivations. Everyone has clear reasons for what they do and say and how they act towards each other and it pays off in a lot of tense interactions between them.
Maybe someday we will get the Halo show we have been asking for, and this certainly isn't it, but it still was enjoyable for me and honestly a lot better than what I expected from a low budget video game adaption.