Return of Reckoning

I have the same issue with Marauder's mutations. Chosen auras are rather nope, but not that big deal for me.
But Marauder, even the very mutations aren't the worst - when you wear only a main hand weapon, the animations whilst mutation look ok (even while one of your limb looks like crap), but when ...

Can someone explain me why should I keep this ability in my rotation while leveling PQs and quests? I can't understand this ability.
I think I am suppososed to use it in dungeon or RvR scenario when group of my allies focus the attack one target together with me?
When I use it I have the buff for ...

OP are you still playing the game? I have an offer for you.