As a DPS I find myself rarely ever getting commendations, even if I try my best. Although with the recent addition of the TP bar, I can goad far better and that's netted me a few more commendations than usual. I got more commendations leveling my Conjurer to 20 something than I did in 3 months before this TP bar was introduced, even though I was doing barely anything but clicking a few buttons (but I guess that can be said about every class during low level play).

I just see it as an incentive for people to play the more needed classes, although I've started always giving the commendation to the other DPS if they manage to do good DPS. Maybe I'll stop being lazy and finally level a WAR or DRK for those rewards.