As much as id want it to be, it isnt. Destro with any comp is not a viable option. The spec just does too little damage.
On top of the damage being very weak, we also have weak ember regeneration along with the loss of Fel Flame. Might just be my opinion but i felt like Fel Flame was a very key ability for destruction, it helped out an unbelievable amount to finish off the rest of an ember, it was also a good totem eater and spell reflect eater. Id prefer not use a conflag to eat either of those.