I agree weapon choice is the key with this. You need a decent delay weapon. If you have over 50%+ haste for whatever situations you really need a 3s at min, a 3.5 would be even better. After a /weapon and your haste is 2.0 after haste is applied, well that means you can get off almost everything besides abom wrath and death circle between swings. Don't loose auto attack dmg for the most part and are still able to cycle through combat arts effectively. Add some DPS buffage, get lucky and have a good fight.. meaning you cycle great without missing a beat, all your swings hit, you roll a decent melee crit chance for that fight.. you will have to worry about stealing aggro and not being dead. It's actually kinda freaky when you get some group procs going, mastery, all your dots, CA/spells, whatever.. and your dmg window is scrolling faster than you can even keep up with to see if you autoattacked
that's when know you are rocking it.