If you want to join graids, you must have pve spec.
The best pve spec when you are using 2 swords like me (glaives) is:
http://wow243.gamestool.net/roguet.php?3050201252000000000000243052002050150003210510000000000000000000000You can change your spec, it all depends on weapons you are using.
Main skill: sinister strike.
Using your combo points:
5 cp - expose armor
5 cp - snd
/// do this all the time
When you are using adrenaline rush you will get extra 5 combo points.
That allows you to use eviscerate after you get 5 cp with ar.
Remember to use your adrenaline rush, blade flurry, snd and trinkets with extra ap at same time so you can deal the best damage with the fastest way, it is of course better when you have bloodlust on.