Getting paired with somebody i have had bad experiences with is so rare these days that i just leave because i don't want to deal with it. I can just do something else for 30 minutes the rare chance it happens. In a raid like CT/WoD/ST it;s not so bad because there are so many people i don't really need to care about them but in a normal party when i know they are a constant problem i just can't be bothered.
In the early days of the game it was a bigger issue because there were only a couple of dungeons to spam for tomes and nothing else no raids until CT came along and only the HM primals for relic so i saw people a lot more often especially in AK DF runs. There was one Tank i really hated because he was so arrogant and comes with a DPS friend up his backside because of the fast queue times and i saw that pair loads in AK for a while. I did have the misfortune of running into them again more recently and they had not changed. Just refuse to run with people who you don't get along with the idea of making a cross server blacklist is not even possible.
