"Defensive" spells generally speaking, are much worse than offensive spells since unless you know beforehand what's coming up, it makes more sense to simply focus on offense and kill the target with attack spells.
For a level 2 party, few casters are going to waste their slots with Prot from Evil due to the limited time it exists (you basically have to be in battle) AND you have to know you're potentially going up a summoner (thus having the spell memorized)
For a level 2 party, few casters are going to waste their slots with Prot from Evil due to the limited time it exists (you basically have to be in battle) AND you have to know you're potentially going up a summoner (thus having the spell memorized)