One of my fondest ME3MP memories was as a Merc (....)
I have three particular fond memories of the Volus Merc.
First, the time we went as a 4-Merc team to Reactor Hazard. There were 8 pets floating around. I recall glancing to my left and thinking, "Fine, Bailey has that side covered," and carrying on the fight on my side. After a minute I noticed it was Bailey's decoy.... 
Second, the time we went as an all-Volus team and did Giant Hazard Collectors Plat. I think the total number of deaths was in single digits, I only went down once, and the game was about 23 minutes. Easiest Plat I ever saw. Two of us were Saber Volus Mercs btw.
Third, PaunchyCyclops trying out the Saber Volus Merc, getting Glacier Cerb, and turning a 4-person game into a solo with 3 observers.