PvP gear is crap. PLain and simple in PvE Operations you will not hold your own run some HM flashpoints and get some Columi then run normal ops
Actually I have to disagree with that statement.
The difference between full Battlemaster and full Columi is mostly in the primary stats. In the forcemaster set for example you lose about 151 endurance and 170 willpower if you wear full battlemaster as opoosed to full Columi.
That translates to a loss of 1.5k in HP and 37 in bonus damage and about 26 in bonus healing.
The person wearing full battlemaster actually have slightly better crit chance, crit multiplier, and activation speed.