The thread is about skills which are useless in PVE. People saying Courage Breaker is useless are saying it's useless in PVE, not PvP. On topic, I agree Path of Blades is rubbish and think Courage Breaker, Infiltrator's Action (getting combat advantage isn't hard), and First Strike are the most useless, just because…
This happens to me, too. It's pretty annoying when it happens in an instance and you either have to try and finish it without stealthing or restart. Please to be fixing it - stealth is kind of important, you know?