
As a healer, I almost always choose one of the DPS to commend. If the tank is particularly outstanding, they might get it. Or I might choose someone who was particularly friendly or amusing. I don't mind the silent runs so much though, as long as no one is rude or avoiding communication when communication is necessary. And if someone speaks up that they're new and then takes the advice given and follows instructions, they're likely to get a commendation for that run. All in all though, whether I'm playing DPS or heals, I tend to default to DPS if no one stands out.