Another Guild Wars Beta Event

[TriggerHappy]

I guess then that every point gives +7% since the req is 0...

That's correct.
This is balanced by the fact that no requirement weapons offer such low damages (but can be used by all classes, not just warrior/ranger) that even 84% more damage (rank 12) will stil not be anywhere as good as say a rank 4 requirement Weapon.

However, I wonder how it is for non warrior weapons like Staves, Wands, Rods, etc', does any point in the corresponding attribute (aka Fire for a staff that deals fire damage) also does that?
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Yes, this is exactly the same for staves/wands/etc. If you don't meet the requirement (say you're using an Air wand but have Fire magice instead or just don't have Air high enough), then you will be doing about 1/5 of the maximum damage. It's important to find a wand/staff that corresponds to the attributes you've chosen.

Also, note that all classes can use all weapons. The problem is that a character without the required rank in the governing attribute of a weapon will never be effective with it, doing minimal damage. So for example, a Ranger can use Apply Poison (preparation) and then deliver that poison with a Wand, he'll never do the stated damage on the Wand unless he's also a secondary caster with the required attribute and rank.


P.S.
I think some of the posters in this thread highly underestimate the Ranger. The class is capable of outdoing even Elementalists in damage output, with the right combination of Ranger skills, a secondary class and a bow with good rate of fire. For example, a Ranger/Mesmer or a Ranger/Elementalist utilising just one skill from the secondary class can output horrendous damage. Even more if one finds very powerful "combos" utilising both the primary and secondary classes. Unfortunately I am not at liberty to reveal these for competitive purposes ;) .