I don't think that a Cleric/Archer outshines a straight archer any more than a melee Cleric outshines a straight tank, but it is a great combo. Our Cleric took Zen Archery last level, and I gave her such a look. Then she told me what her 3 attacks were at, adding in her BAB, considerable WIS, and a +6 Periapt of wisdom. I apologized.
Combine that with feats like Reach Spell, and even a weaker combatant can hold his own in a fight, stay out of imediate danger, and still fulfill a Clerics support roll.