Legendaries are better than yellows in a LOT of slots. Belt, pants, chest, helm, feet, sometimes bracers. In a lot of cases, Legendary weapons are better too, but that depends on the build. I actually dislike this, because Witching Hour means no rare belt ever is worth wearing unless you just can't get a Witching Hour, because they can't roll IAS and Crit Damage. This problem goes back to what that guy on the D3 forums made the epic post about, how there's 3 DPS stats, every single spec of every class needs as much of those stats as possible, and any item with those stats is better than any item without them. THAT is what they need to address with itemization, I couldn't care less if legendaries are always better than yellows or not.