I have Mark 1 bound to Shield Lob so I can mark from afar, or mark as I come in. As someone else said, DPS generally do not like to wait, even though they ALL should. Basically my opening rotation looks like this when there are 3 or more mobs.

Mark 1 Shield Lob Mob A
Flash x2-4
Fast Blade Mob A
Savage Blade Mob A
Rage of Halone Mob B
Repeat to Mob C then check Mob A Hp/Hate. Move to Mob B

Once you've secured a decent amount of Hate on Mob, it's generally hard to lose. As you can see, we come in with a mark, and drop our AoE enmity generator, then work through the mobs to generate threat on them all. Once your targeted mob is low on health, you can pretty much drop it, and start on the next one you choose while the DPS kill it. Marking helps DUR-PS's, and keeps combat flowing.