A tank will always view that being as rude, even if it was an accident (a tank let me KO because they suddenly stopped while I was auto-running and I was looking back at my dog. This was in Qitana right after the first boss and I activated the bats). Anyway, the tank should always be expected to do big pulls in Expert, 80, 50/60/70 roulette. This is the norm and I doubt I've been consistently lucky with getting tanks who want to do wall to wall pulls (I'd say 9/10 tanks did wall to wall pulls and the tanks who didn't would sometimes be forced to do big pulls either by the healer or other DPS).