Just as an example, I ran scaling for an Arms warrior in full 522 pvp gear, versus a subtlety rogue in comparable gear. Subtlety rogues in pve scale pretty well with gear - so I figured that would be a solid comparison point.
Scaling |
Arms |
Subtlety |
Str/Agi |
3.77 |
6.49 |
AP |
1.95 |
1.71 |
Exp |
4.90 |
2.52 |
Hit (to yellow cap) |
6.36 |
3.05 |
Crit |
2.26 |
2.15 |
Haste |
1.56 |
1.90 |
Mastery |
1.95 |
2.00 |
Weapon DPS |
13.26 |
7.85 |
Weapon Speed |
1777.81 |
786.08 |
So as you can see, Subtlety rogues adore agility - more than Warriors adore strength. Arms scales better off actual attack power however than Subtlety does, which is interesting. Expertise and Hit cap are way, way, way more important for warriors - because they provide soooo much to them compared to Subtlety. Warriors scale better off crit, worse off haste, and about the same off mastery.
Then we get to weapon damage and speed - an upgrade to a warriors weapon is worth TWICE the benefit that an upgrade to a Subtlety rogue is - and weapons are freaking amazing to everyone. Weapons have so much of our overall damage invested in them, that those massive multipliers to weapon damage and speed mean that warriors are actually outscaling subtlety rogues by a significant margin.
If a warrior were a subtlety rogue, he'd be wielding four daggers instead of two.
Note: Warriors are clearly very strong right now, but I'm not throwing this out there to piss on the warrior parade - I just figured I could answer this scaling question more definitively for everybody