Hammer of Wrath is currently scaling off of Ranged Attack Power instead of Melee Attack Power. This is incorrect behavior and does not match the tooltip for the ability which references Melee Attack Power. Here is the math confirming this:
Gear set visible at 80up/set/jGR8tfjkemobf2a1QBeePy
Melee Attack Power - 3549
Spell Power - 1064
Ranged Attack Power - 1568
Following the tooltip and using Melee Attack Power to calculate the expected damage range:
1139 -> 1257 + .15*1064 + .15*3549 | 1139 -> 1257 + 159.6 + 532.35
1139 -> 1257 + 159.6 + 532.35 | 1830.95 -> 1948.95
1830.95 -> 1948.95 * 1.03 | 1885.8785 -> 2007.4185 (3pt crusade) (3%)
1885.8785 -> 2007.4185 * 1.03 | 1942.4848 -> 2067.6411 (3pt crusade) (3% humanoid)
1942.4848 -> 2067.6411 * 1.03 | 2000.7593 -> 2129.6703 (sanctified ret) (3%)
2000.7593 -> 2129.6703 * 2.0 | 4001.5186 -> 4259.3406 (crit) (200%)
4001.5186 -> 4259.3406 * 1.03 | 4121.5642 -> 4387.1208 (meta gem) (3% on crit)
When tested in game however I see crits such as: 3484, 3462, 3538, 3662, 3710 3668, 3462, 3570, 3711
If we recalculate the formula using Ranged Attack Power instead:
1139 -> 1257 + .15*1064 + .15*1568 | 1139 -> 1257 + 159.6 + 235.2
1139 -> 1257 + 159.6 + 235.2 | 1533.8 -> 1651.8
1533.8 -> 1651.8 * 1.03 | 1579.814 -> 1701.354 (3pt crusade) (3%)
1579.814 -> 1701.354 * 1.03 | 1627.2084 -> 1752.3946 (3pt crusade) (3% humanoid)
1627.2084 -> 1752.3946 * 1.03 | 1676.0247 -> 1804.9665 (sanctified ret) (3%)
1676.0247 -> 1804.9665 * 2.0 | 3352.0493 -> 3609.933 (crit) (200%)
3352.0493 -> 3609.933 * 1.03 | 3452.6108 -> 3718.23099 (meta gem) (3% on crit)
Which matches our actual values see in game which all fall within the 3452 to 3718 range.