GW2 I like to call it Ghost Thief 2.0: Thermal-nuclear alpha War 2. Apparently one/four-shots (under spammable new target Quickness boon) is OK from invisibility from a game balance standpoint. In as little as 0.6s time to react not including lag, you should know that a DE will attack you while you are engaged with any other activity (taking a camp, sentry, running seige, standing on a point for capture, running from point A to B, etc.) You aren't safe even in your own towers/keeps because a DE may be inside so don't afk. In all seriousness, Thief does not ruin WvW. Deadeye ruins WvW.