Harm? Certainly. (Mass) Heal is as bad for undead.
Unless the creature has a resistance (Negative Energy Protection, Shadow Shield) or a very high regeneration rate, Harm and a follow-up with, say, Searing Light is going to be lethal.
Also, a single level of one of the mage classes can get you Truestrike, which gives you +20 on your to hit roll for just long enough to help the touch attack.
Though Negative Energy Protection is very powerful for its level too, defensively. It doesn't make you immune to disease and poison, but it does keep their negative effects away. It also stops necromantic spells from Negative Energy Ray (1) to Wail of the Banshee (9), and has a few other perks as well. Not bad for a level 3 spell.
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