Well, the main problem with making machinima in Halo 4 is elites, almost all machinima are based on Spartans v Elites excluding a few, so why 343 didn’t include them, I don’t know.
Another problem is, no flying vehicles for the UNSC, that’s a real disadvantage for making machinima in my opinion, even though the Mantis is in the Falcon/hornets place, it doesn’t compare to having a flying UNSC vehicle. It would even be good to have a Hornet/Falcon on War games.
It’s also hard to build a good machinima map with the new magnet technique, it was far better on Halo: Reach when you had to push the analogue stick down to slow down the movement of blocks.
There’s also no covenant equipment such as covenant crates, plasma batteries, which were on Reach, it would also help if they went further and made some covenant computers, covenant barriers, covenant portable shields, and it would be even better if there were different types of blocks, such as covenant building blocks, that probably won’t happen but I thought it was just a good idea :]
Even though armour doesn’t matter as much, it would be good if there was armour from previous halo games, such as security from Halo 3 and Reach, and commando from Reach, this would make machinima look far better. It would also be better if they brought back traditional armour such as ODST. Even some of the Spartan helmets don’t look “Spartan-like”, things such as infiltrator, Engineer, C.I.O and venator etc.