I think if their spell list were expanded even slightly to have at least a few offensive spells in there, and they were allowed to cast spontaneously, they would be a pretty good class.
Edit: Is there a feat like Arcane Disciple for divine spellcasters? If not, why can only arcane spellcasting classes gain domains with feats? Seems a bit silly that divine spellcasters can't gain domain spells as well.