So Cleric, Shaman and Druid often run around with Tank mercs. Warrior, Monk, and Ranger duo with their Cleric mercs. These pairs seem straightforward given game mechanics.
What should a Mage run with? Cleric, obviously you say.
How about a Wizard? Well, up until today I used a cleric and it worked out well. I twinked my level 71 Wizard with Othni gear and she can take a bunch of hits from pirates in Buried Sea without having to be careful when kiting.
I switched to a tank merc and she is an even better killer.
It just makes more sense for my play style and is less stressful letting my tank get the mob to 80% and then burning it down. (The "Hey, what was that?" aggro reduction AAs rock for this)
Anyone else out there not using a godly OP cleric merc like they are "supposed" to?