A team of 6 mes would play a bit more of an old-school style.
My scouts would be wildly inconsistent and mostly good at cleaning up frags, not doing damage, so we would play off the damage of our soldiers and demo, if we can get over the awful positioning of my soldiers.
Sniper would be off-class of choice for pushing lasts, since once in a while they would just go off and single-handedly win pushes, even if 90% of the time they do fuck all.
We would probably try some idiot strat once in a while that will wipe the team because we full commit.
Most of the time though, calls would be strong -- getting out of midfights when at disadvantage, tracking ubers, etc.