DPS have probably the worst time for grinding sets in dungeons if you are not running a party finder. Leave it to another layer of RNG if you both DPS are caster as an example and fight for that random piece of gear that you might see it after a number of runs.

And i speak as a tank that took so much time to get the alliance fending coat. Having good rng in these dungeons does not make any unique or satisfactory. You get that shoet burst of happiness and toss the gear into your tiny limited glamour dresser lol.
You get token for extreme fights in case your luck is absolutely painful until 99 runs for the mount.
Also I realize triple triad players are also in a constant pain to get cards from dungeons or even in side content instances, my god.