Looking through the loot tables, something strikes me as rather odd. I play a boomkin, so I've mostly paid attention to the caster leather loot, ALL of which, has spirit on it. I then, compared this to the cloth loot, which is in fact, the complete opposite. NONE of it has spirit. I can imagine healing priests aren't too happy with that.
And on another note, looking at the loot from Ragnaros. In terms of armor, there's 2 things for clothies, 1 for caster shamans, 1 for plate tanks. Considering these items have a higher item level, and therefore slightly higher stats, overall cloth wearers will have better gear, or at least have better gear available. Leather wearers get nothing, similarly to agility using mail wearers, plate dps, and holy paladins.
The trash loot also makes no sense! For example 3 things useful to hunters, and as far as I'm aware, nothing used by holy paladins. The trash also holds the only useful weapons for warriors using SMF, and duel-weilding dk's; there are no 1-hand strength weapons from any of the bosses.
Where is the logic?!