Compared to the stock fire which ArmA III uses on exploded vehicles, for example, the recently added "module" fire is way better looking.
The ArmA II fire is even better than the ArmA III stock fire, but not better than the ArmA III "module" fire.
This should be really easy to fix beacuse the better particle already exists and shouldn't be created from scratch.
Official BI post about the new module particles: http://forums.bistudio.com/showthread.php?155866-Arma-3-Particle-Effects-documentation&p=2605757&viewfull=1#post2605757
Video which shows the ArmA II fire: http://youtu.be/93NketKf_ZE
On the bottom of this ticket you will find two screenshots, one using the "module" fire and the other with the standard ArmA III fire. {F23114} {F23115}