Because Firelord is a flier, he NEVER enters into close combat. He can ALWAYS use RCE against you (unless it's outwitted).

Sure that new Superman is scary for 235? points. For that many points I can get Firelord (E) X2, Doombot (R) X2 and Black Panther (R). That team would destroy Superman on the first turn.

As for beating Firelord, as someone said you need a high attack to crack that 18 defense. Whoever said rolling 8's is easy hasn't played with my dice. A 7 is right around 50% anything above that the probabilities decrease rapidly. Firelord has 10 clicks of life, unless you get extremely lucky even a good double team won't kill hit outright. You have to make sure your damage sticks. Targeting his Medic first is usually a good idea. If you can't do that, tie up his taxi (if the player knows what they are doing he'll have one) after you damage him to prevent the easy heal. Outranging him is always good, Bullseye (V) and Wasp (E) for a free-moving taxi is a good way to take him on. Through in a Black Panther (R) to outwit his RCE.