I've always hated playing anything, live or online, with people I don't know. I never played WoW, but I've been playing Star Wars: The Old Republic for the past couple months, and some of the peeps in that game need orbital bombardment with banhammers while getting Force-choked.
They're just endlessly grinding flashpoints and operations to upgrade their endgame gear, and they spend the whole time they're queued up in the group finder waiting for the next run insulting each other and talking crap about anyone who isn't l33t enough to have ten max-level alts on multiple servers. Then when the missions start, they take off on a speed-run, following the most efficient path directly in each other's footsteps like a pack of AI-controlled lemmings. If you don't know where you're going or if you die, they'll leave you behind rather than take the time to boot you from the group...