Damage from Death From Above should not be any different in this patch. All that was adjusted was the radius of the effect. Damage is applied faster now (every .5 second instead of every second) but the overall damage is the same.
Not to put too fine a point on it but, lowering the radius lowers the overall damage output, does it not? That is to say... if before you were hitting 4 or 5 bad guys at once and doing x amount of damage, but now because of the smaller radius you are only hitting 3 of them for the same amount of x damage, then overall it's less damage, because you're not doing damage at all to 1 or 2 that you used to be able to hit. Right?
By that rational, it's a pretty sharp nerf.