As a person who generally plays casually:

I never had any issue with Overpower.

My issue with WAR's AOE damage combo was more that Mythril Tempest was NOT a cone. While some loved dodging and weaving in and out of the enemy pack to go back and forth between circle and cone, I found that more annoying. I'd rather they have changed Tempest and Decimate into cones. That way, WAR would keep its more unique gameplay.

Not to mention generating threat is such a joke now, you could hit an enemy with the initial Overpower and even if it DID move outside of the cone of subsequent attacks (pushed outside by large mobs in the center), you wouldn't lose threat for half an hour anyway. And tank self-healing generates agro, too, so it's not like WAR would lose the mobs most of the time anyway.

And speaking personally, I prefer cones because (range aside) enemies usually kind of fan out in front of me rather than completely encircle me. Part of this is the way I move (from playing tanks years ago in other MMOs where you wanted to keep them in your front cone becasue if you did not, you couldn't parry/block attacks from behind you), but it's also the enemy AI. Just making them all cones would have been the best solution, imo.