In a post in our own Rampancy.net forum, Bungie's Matt Soell has responded to some of the complaints about Oni not having the ability to save game films. Most previous Bungie games, including all the games in the Marathon and Myth series so far have had this. From the post :
As trivial as the idea of adding a replay option may seem, it's not that simple. How much time would it take to add saved films? Off the top of my head I don't know, but the question is moot at this point; if the Oni team feels it can't be done in a reasonable timeframe, I defer to their judgment. We need to finish this game.
Thanks Matt. Hopefully the experience of playing Oni itself will override some of the shortcomings in terms of film saving and multiplayer options.