Pretty much how I feel with it as well. Life Tapping wouldn't be that big of a concern, beyond an annoyance, if Destruction had better self sustain like the other two specializations. Destruction has to tap arguably more frequently and rotationally to perform while not being able to undo the damage.
Even just Demo tier regen would be amazing compared to where its at now. The two damage mitigation/healing perks for Destro's artifact are jokes.