Return of Reckoning

Ty for your advise guys, yeah as marauder i'm already in path of savagery, sometimes in switch stance for monstruosity to get juicy aoe and heal.

Actualy my average rotation is : snare > touch of instability ( only casters ) > mending > corruption ( after mending to avoid dispell ) > spam dot with ...

Oy, i'm a newbie playing chosen 2h and marauder both 25 and i just dont know how my team is supposed to deal vs mass heal, i just feel useless in any situation :

As a chosen, i have ok dps and healers can even grind my health in 1v1 .
I've tried many things : stealing action point, using anti heal ...