@Meddler: "If the attack that procs Backstab would crit normally, it now deals normal crit damage"
It's great that you fixed this for Shaco. Can you do the same thing now for Xin Zhao? His new W has the same issue (and got overlooked because most Xins don't build crit).
(EDIT: according to the comments, Fiora is broken too)
http://i.imgur.com/DvJaJZb.png/img
(source of the Shaco change, for those who don't know: "If the attack that procs Backstab would critically strike normally, it now deals normal crit damage rather than Backstab’s reduced crit damage" http://na.leagueoflegends.com/en/news/game-updates/patch/patch-624-notes )
and any other poster boy dont count.