Class(es) that get most/least mileage from BiS

[Wikipedia]

I mean in terms of an item's stat budget, Necro and Shaman are the main two that can get genuine demonstrable use of a +100hp/+100mana Vulak item or whatever in practically every situation, especially on non-aoe bosses where other classes can get zero value from HP.

That said you could argue that both those classes have limits in terms of usefulness, i.e. shamans can dump extra mana into nukes but on velious content the only nuke that lands well on bosses only does like 2 DPM max so yeah.