I think the new lfg system is fantastic. The vast majority of pugs are a breeze, but I've had a couple where the tank just wants the two frost and wants to skip bosses.

One guy was pulling when the healer had no mana - let the healer get killed. (lied and said he disconnected when I could see him going through his tanking rotation). He said he was going to skip bosses, going to get to the last boss as quick as possible. - we asked him not to. He caused so many problems. And was a total ass when we caught aggro on mobs he just ran by.

So we used the other fantastic thing they introduced. Waited till we got to trash before the final boss and voted his backside out of the group. I can just imagine the nerdrage.

But that's one prat out of loads of groups.