I should specify that I'm referring to the flame variation.
I didn't get to high level on my DK pyromancer in the beta but from what little I saw of it the damage and duration of the ability was COMPLETELY laughable. Over the whole duration it did about as much damage as 1 light staff attack.

so I give points for that, it would be nice to see either a longer duration (my preference) or a higher damage output from it.