Me on run I work my butt off for: 0 commendations
Me half-assedly tanking Titan HM for lights and maybe the triple triad card: 7 commendations even though tanking is the easiest job in the entire fight.

You can't force people to give you a comm. But the protocol that we've had since they introduced the system was tank comms healers and DPS comm each other, that way everyone walks out with something - unless the person did something to UN-earn a commendation, or someone else pulled out something amazing.