If this game has a proper spectator mode ...
For a proper machinima, you need at least something similar to Halo. Even better something similar to Uncharted 2 (theatre mode).
RvB just used another character to "film" for the longest time. That's why they have the black bars at the top and bottom in the first few seasons, to cover the HUD. So lack of spectator mode doesn't prevent machinima.
There are actually some pretty amusing stories of how they got certain camera effects in RvB. Like in the start of the first episode, they have the camera rise up over the side of the base to find Simmons and Grif talking. In order to do that they had the cameraman standing on a scorpion tank as it drove up the wall. I forget how many takes they said they took to get it right, but it was a lot.