Here are the DMs from our Patchwerk kill:

(omg 10000 raid DPS that's impossible there must be a gimmick -- no).
Anyway, Patchwerk is a fascinating fight for the theorycrafter in me, because it really is like a benchmarking program for all your DPS classes. You are doing sustained DPS against a motionless target for 6+ minutes, in an environment where everyone is using mass consumables.
What really struck me about the above list, for us, is that there was a shockingly accurate correlation between DKP Earned/Spent and rank on the DMs (with the exception of Wodin, who was stuck in a group without Windfury and such by necessity and dropped a bunch of ranks as a result). That makes me happy, because it tells me that everyone is pulling his or her weight, and that our pricing structure is at least reasonable.
What did your guild's DMs look like? I'm curious to see Alliance vs. Horde differences, or differences according to specs. In the above, all of our rogues except for Khazal are some flavor of combat daggers, and all the mages are Arcane/Frost or Frost/Arcane. The three warriors up top are all Fury. (The warrior at the bottom is Arms, but Arms sucks for this fight and he was thunderclap-bitching for the whole time anyway so burning lots of rage on that.)