Yes. We do not speak of it here.

You could say that nobody remembers Halo: Nightfall because of how spectacularly boring it was, but I think it's a mental defense against remembering how gawdawful it was.

Come see the main character (that nobody cares about) from the upcoming Halo game (That won't hit for another year) bungle his way through the thinnest SciFi Channel excuse plot you've ever seen!

Watch as he's saddled with a bunch of forgettable assholes that work together about as well as the typical cast of nobodies in a budget horror movie!

Watch as the Covenant use a cheap plot device (It's a biological weapon! It's an element! It only kills humans! It's mined from the fragments of Alpha Halo!) as a terrifying weapon of mass destruction to kill a fraction of a fraction of the number of people they could kill with a single plasma torpedo.

Watch as the Generic Horror Movie Protagonist Ensemble stumble their way onto Sedra, a colony that is technologically 200 years behind the UNSC (because we blew our CGI budget on a crappy-looking Elite and unconvincing Lekgolo monster worms), a curious backwater colony where horses inexplicably coexist with supersized dropships that sport slipspace drives more advanced than the 2552 UNSC standard!

Oh, and remember what we said about blowing our CGI budget on crappy aliens? Meet Axl, chief Not-Ferengi of the Rubberforeheadian clan!

Or you could watch something more interesting instead. I've got a recommendation or two.