Well.. what I do, and Im sure people will have different techniques and such, but for Leveling, lets say, taking on an Elite with 2 normal adds.
Send Kira to attack Elite, I Leap on First Add, *Free Bladestorm Pops Up* Use that on The Other Add, Kill both Adds in the next few seconds. When Kira is getting to about 1/3 Health, Taunt the Elite off her and then Start using Sundering Strike whenever its off Cooldown, and Just Build Up Focus with Strike when Sundering Strike is on Cooldown, and When other things are go for a Master Strike, that works for me...
PvP I havent really got a rotation, I just kind of mash keys and that works 50% of the time