It's okay with friends and such, but certain pickup groups can be SO ANNOYING after experiencing organized raids in end-game instances. God.
QFT
>Late night UBRS PUG trying to get a couple of new guildies Onyxia attunement done<
-OK mark one of those dragons, then DPS it down quickly. Sheep the rest
*20secs later*
-Mark?
*20secs later*
-Hunter wake up and put a mark on that dragon
-Still waiting
*30secs later*
[Hunter]: soz woz AFK, wot am i doing?
-mark my target
-yes....hunter's mark -.-
-ok, now focus all dps on the marked mob
*the mages sheep, raid attacks different mobs*
-uhm, focus dps on the marked?
-I'm tanking three here, give me some more healing
*dies, adds run rampant*
-uh wtf?
[Priest] an orc was attacking me
-resheep ftw?
[Mage] wha??!?
*wipe*
-/cry
Now we have set aside a day for shit like this so nobody has to step foot inside an instance with a PuG retards again.