I've actually had some luck with this. If someone makes an edit that doesn't hurt anything, but doesn't add anything either, I simply revert with the edit summary "rv: not an improvement". This seems to send a message to people that edits need to be constructive and have a
That's an incredibly hostile way of editing. What happens when someone thinks that your "rv. not an improvement" is "not an improvement"?
-- mvh Björn