He was actually correct. Mercs are easily on par with marauder in terms of damage output. The point he made was that in a warzone mercs don't get to freecast like they do on op bosses and hence can't pull the same numbers.
So why is he bringing up PVE situations into a PVP discussion? Because he has to stretch so hard that marauders aren't OP that he has to bring in PVE situations in order to defend his claim. It's getting pathetic.
You are losing ground here, marauders got the best defensives. Who else has god mode? You say juggs get saber ward...oh guess who else gets saber ward? Honestly the only marauders defending this class so much don't want to get there OP life style changed. There is a reason why there are so many sents/marauders in PVP, gee where are all the Op/merc dps?