That's fine at 8, but at 14 or 17, wands and melee don't work too well to polish off monsters (which are also likely to be considerably more dangerous too).
I don't mind kiting six Stormcleave giants waiting for Cone of Cold to come off cooldown - kiting five Ghaele Eladrin and one Bralani Sorceror is a little more awkward. For this reason I would currently approach a room in Running with the Devils with a DBF, then if the DBF didn't crit, a Fireball, then if that didn't crit, whatever third spell would finish them off, whereas in Stormcleave (if I decided to approach the quest in nuking mode) I'd be fine to throw a Cone of Cold then use other spells to clean up.