There are two tanks in Farm Parties:

The ones who have macros
and
The ones who don't have macros.

I've noticed that when I tank farm parties, and I use my macro's (because no one else was doing it), we tend to clear easier.

When I try to go as DPS or Healer, and the tanks don't have macro's / don't use macro's / "It's the tanks responsibility!" (derp): It tends to be a wipe fest.