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Until recently I used the play the merc the team needed the most, which almost always ended up being a medic or engi. But when you keep reviving players that trip over their own feed and break their neck 3 seconds later or plant a C4 nobody defends it's really frustrating. And having 3+ recons as team mates didn't improve my mood by much either.
But I finally figured out how to have fun in DB again:
Pick Aimee and two of the useless mercs you never gonna play but which have "20 hour in squad" achievements. For me, this would be Phantom and Hunter. Then play "pistol mostly" Aimee running around like a headless chicken and spam your SNITCH all over the place. The average casual will never find your SNITCH so you end up with more support XP than your medic (which usually there is none these days).
Of course this will not work with skilled opponents, but fortunately there are hardly any as long as you stick to CMM.
I'm sure that was SD's original vision of the game. If only I had known earlier.
There is no ELO acronym, the Elo rating is named after the guy who invented it.