anothersorrow, Duelist flurry isnt the only way to do dmg but it is the main source of damage for rogues in PvE and contributes to most boss damage during current T2 dungeons. No enounters can match DF's damage at the moment and I doubt they will even post nerf to DF and buff to encounters.
So basically, a 60% reduction in crit severity + 50% less DF dmg means CWs will top the damage ranks in both AoE and single target DPS. What is the point of a rogue class then? Well played whiners of PvP, you just ruined a perfectly good class. Might have to start running 4 CWs and a Cleric post patch.