I've been going into dungeons recently, as Dragoon, and getting 2 out of the 3 commendations almost all of the times.

I talk, I crack jokes (really really bad ones), I act supportive.

I also don't die like 95% of dragoons who don't know how to play a survivalist class.

Playing your class right might seem like what gets you commendations, but it's attitude. It's like how I never commend people in Dota 2 who scream "commend me" a hundred times. It is not YOUR right to be commended, but your party's right to commend you.