Furthermore, Vengeance is only useful when you're actually being attacked. If you're being attacked, you've already got aggro. As such, it's there as a DPS increase, but it's not a useful consideration for aggro generation. On top of that, Vengeance still has that 120 second CD and 15 second duration. At 1 attack per GCD, Circle of Scorn is going to provide just as much threat and damage as Vengeance is, and Circle of Scorn is on a much shorter CD.
Steel Cyclone is another one of those completely worthless abilities to bring up in the discussion. Steel Cyclone is the equivalent of a whopping 266 enmity potency and actually ends up being *more* expensive thanks to costing Wrath stacks. Overpower provides 240. Steel Cyclone is so bad that it could stop existing entirely and it wouldn't affect the way WAR is played *at all*.
You're behaving as if AoE occasions exist completely independently of the rest of the fight. You *have* to consider the resource costs of the abilities and the opportunity cost that using the ability accrues. Flash doesn't have *any* opportunity cost because it's functionally free. Overpower has a *massive* opportunity cost. Every time that you use it, you're cleaving off ~20 seconds off of your effective fighting time. Use it more than 2-3 times and you're going to be incapable of doing damage to the actual boss a short time later, and that ends up costing you a *crapton* of damage in the end.
Opportunity costs matter and Overpower comes with really high ones. That's what you seem to be incapable of understanding, no matter how much I tell you.