What's fun is to read guild post from people that say something like "BURN THE MQ2 USERS!" but then you see them warping around when they think no one is watching.
Best plan to me is check if someone is in zone, then don't use anything obvious if you aren't alone. Then keep quiet about it if you notice someone trying to use it carefully; you know throwing stones, glass houses and all that.
If someone is obvious and stupid, avoid them like the plague. If it's a guild member consider talking with them, if they are still to stupid to be cautious, talk to the officers. No sense in your guild get screwed over.