Any Point In Buying Mists?

Ok, this isnt a QQ thread before anyone starts on that track. Im just wondering if as the title states, if there is any point in me buying it. Ive been playing since TBC and have always played melee classes. Now however, no matter what i do, im getting spanked in 2 to 3 globals by ranged. Compare that to melee not doing half the damage of ranged, its making me think i will be waisting my money to buy the next expac.

To give an example, i seen this in a thread about locks

50k shadowburns on 60% resi?
26k haunts?
70k Chaos Bolts?

and thats just locks! Im not going to mention mages,tabtargetmoonfirespamkins,hunters or shadow priests.

Now i know the responce that will come is 'But its tuned for level 90'. Well think of it this way. Damage scales UP with gear, so using that logic, at level 90 casters will be one shotting people. Now if melee scale up too, then if they are lucky, they will be doing the damage at 90 that ranges are doing at 85.