Dr. Fate's fireball may be the most damaging non-trait and non-EX fireball in the game. The fireball also does more chip damage than Aquaman's FTD. In comparison, Sinestro's fireball did less chip damage than Aquaman's FTD and was punishable at mid range in Injustice 1. Speaking of mid range, though, some characters can crouch the fireball, depending on the hitbox, but you are safe against the vast majority. Besides, if opponents are crouching and waiting for the fireball to whiff, put an orb on the screen.
f+2 xx push should also be acknowledged as a good footsies tool. The push is -8 on block but safe against every character that I tested with the exception of Batman. He can punish the push with bats if he is adequately close.