But it isn't
... my answer above yours is wrong, too. My twink rogue finally hit 99 yesterday. Did some simulationcraft before and after hitting 99. For my current gear, those are the stat weights (and the reason, why i'm not wearing the warlords crafted daggers, eventhough i have them.):
Assassination (Item-Level 620):
______________Agi__Wdps__AP__Mastery__Crit__Mult__Vers__Haste__WOHdps_
Scale Factors___4.70__4.30__4.25__1.80___1.75__1.71__1.58___1.46___1.31_
Ranking: Agi > Wdps ~= AP > Mastery > Crit > Mult > Vers > Haste > WOHdps
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Subtlety (Item-Level 620)
______________Wdps__Agi__AP__Mult__Mastery__Crit__Vers__Haste__WOHdps_
Scale Factors____5.15__5.12_4.04_2.36__1.85____1.74__1.70__1.58____1.18_
Ranking: Wdps ~= Agi > AP > Mult > Mastery > Crit ~= Vers > Haste > WOHdps
!!! Keep in mind that those are pve weights, multistrike and crit is worse in pvp because of their reduced effects. (Crit only inc. dmg bei 150%, not 200% and multistrike only procs once not twice.)
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The only things which should be used are "tools", set-bonus for a 30sec vanish or evasion and stuff like that. You will lose dps ofc but you can do something others can't. So it's not wrong to use some old stuff funwise but if you are going to maximize the efficiency than you have to go with 600+ on every slot. Agility scales just to good to be left out.