The one negative that a vote-to-kick option would have is: Say if you PUG into an almost full guild group via Duty Finder, after you down the last boss (for example, or could be any boss, for that matter really) that guild vote kicks you so they have a better chance of getting gear for their members -- and you are left with little or nothing at all. They could just repeatedly spam this during a full raid, totally abusing DPS (since they are a dime-a-dozen), on every boss: Just PUG to clear, then kick before click on the shiny. Not sure if this game has looting ranks/rules/roles that would have certain members to be entitled to gear while precluding others.

Other than that, vote-to-kick is a great mechanism to allow players to police themselves.