Stamina is a really undervalued stat for cloth. As you get deeper into the game it goes from "I took damage because I tarded out" to "I'm going to take damage this fight, and I will hardly be the only one taking damage at this time so I might not get a heal fast". Anyone who has done Ouro or C'thun or most of the stuff in Naxx knows that stamina on a mage or priest is hardly a wasted stat. And it was never ever ever wasted on a warlock, of course.
My main beef is intellect, honestly. The amount of crit a cloth caster gets per point of intellect is very very meager. So all it really does is boost your mana pool, which isn't very imporatant anyway for any of the cloth casters. Warlocks tap and bandage back their mana, mages use mana gems and evocation, and priests stack spirit and mana per 5 gear to regen their mana, or get innervates. In a decent duration fight I regen more mana than I start out with in my mana pool by a good margin, especially if I eat an innervate (I have 410 raidbuffed spirit and about 50 mana per 5).
Spirit is fine for priests but druids should be extended the same regen calculation as priests currently get. It's worthless for mages and locks, but that's not a real problem since they don't really get too much of it on their gear anyway.
Saitoh-I still love the Nefarion fight. I'm an agent of alliance easymode in the fight (being a Dwarf priest) but I really enjoy everything about the fight. Especially the time right after the huge zerg spawns at 20%, it gets all crazy but then once all the adds are dead you know you've got the bastard dead and can just enjoy the rest of the fight. And once you get Nefarion down and are starting the horrific waste of time that is AQ40 (I recommend just going to Naxx instead, seriously), you'll miss how nicely designed BWL is and wish you could farm that twice a week instead of doing AQ40 and BWL. ;p