I have noticed I tend to get more commends as Ranged DPS more than Melee though. Not sure why.

I always make sure to use my aggro tools properly (Shadewalker/Smoke Bomb), and TA when it's up to make sure stuff dies fast enough.

I just kinda show up as my MCH or Archer (haven't gotten BRD yet) and I just get thrown commends like roses to a bull fighter.