I do my best every run, but I don't expect commendations. Personally I give them not only to good performers but also to people who I enjoy to play with. If yourself were healing a run I was in, but say a BRD in party also did their job well, but also was chatty, funny and made the run memorable, I'd give them the commendation over you. Some people just don't commend at all, too much hassle to click lol. Don't take it personally!