Dungeon Finder ... woeFollow

APM is a bad measure of skill as others have said.

I haven't played every class/spec in dungeons, but in solo routines...

Combat Rogue:

SS SS SS SS SS SnD SS SS SS SS SS Evis

Compared to Shadowpriest:

SW:P, Dev Plague, SW:D, Mind Blast, Mind Flay, wait 3 seconds, Mind Flay, wait 3 seconds, Mind flay.

5-6 Actions on the Shadow Priest, compared to 10+ in about the same time as a Rogue.

Or, how about Arcane mage?

AB.....AB.....AB.....AB.....AB Barrage/Missiles AB.....AB......AB......AB

lol.