I sleepily went "Hell yeah..." at seeing the kick vote changes. I only kick obvious leechers (ya know, close enough for xp and loot, far enough to NEVER get in combat), odd idiots (hai Mr 400dps prot warrior (whom signed as dps) trying to outpew us 4k+ people while never ever replying to ANYTHING we say), and arsehats. The type that'll kick up a huge drama for no reason, or decides to join as a tank tho' all it can do or is willing to do is pew and refuses to leave.
Otherwise I'm quite tolerant of the people I find in pugs, and very rarely use the kick system whatsoever. Never really abandon instances too, even when it's occy 4 times in a row!