Firecat has so many effective build choices, both at low and high ranks - you can do almost anything on Firecat and be effective. This is due largely to it's Fuel Air Bomb which deals moderate damage and is able to recharge itself - similar to Rhinos Mighty Charge, except Firecat isn't a one-trick pony. Should Firecat fail to reset it's HKM - it has many other options at hand to continue dishing out extreme amounts of damage. Due to Firecats flexibility in build choice - it is hands-down the easiest frame to play well in Firefall.