Well the difference between a Tempest and an Assassin in a boss fight is not that huge, so yes thinking twice I agree with you to be honest. I would consider choosing an Assassin if it made my tank's life easier. I hope that after the epic reaper exp buff we can run some tests with guildies and see how well Debuffing performs. It can really help reviving dead builds and add some diversity to groups. I know a lot of people who love playing Assassins and I hope this may give them a reason to do so.