Not normally at level 8 when the spell becomes available. I think too many of you are thinking "When I'm high level and have 100% resist and this spell heals me instead of damages.. I don't see the problem..".
I got the spell around level 10. My warrior still takes damage from using it, but they are also a tanky warrior. This playthrough wound up being easier than I would have liked (I got Leech and Glass Cannon on my people before realizing how OP they are, and don't fancy respecing). So either with that in mind, or regardless, I don't consider the minor damage from burning to be that big of a deal.
