So, what's with the lack of Machinist in DF?

[Kaurie]

If I que as a tank and see 2 machinists or 2 bards I usually leave the group and try again in 30 minutes depending on how fast they kill the first encounter.

As much as it sucks to have 2 DPS with a lower potential, this is a weird and rude behaviour. You're wasting a lot of time for them to potentially save yourself a few minutes (not really because you get the penalty).

I want to reiterate that the potential is less, but not necessarily their DPS. A bard can do ~90% of a black mage for example. However, I've yet to see anyone in DF pull better than 86% of my damage done with my ilvl 212 summoner (yes I realize aoe on summoner is insane, but most summoners I actually see pull 73% or less and the one who hit 86% was a monk.) Long story short, the player skill is more important than the job played.