As the title says. Most of the Tyria/Prophecies Greens are useless. They are easily beaten by Faction/Nighfall Greens. In some cases even collector items are better.
The caster weapons are in most need of upgrade as most are 10/10, 20/10.
Bringing these items 'up to scratch' I believe will make a much broader market, as people will have more options for a top class weapon.
I agree, I have sold lots of customized prophicies greens in order to get the factions/nightfall weapons with better stats. I almost made the mistake of selling my Dragos Flatbow too, but fortunately I put it off and then anet made them all 20/20.
Update - Wednesday October 25 Equipment Balance Changes
Green item staffs, crafted staffs, and collector staffs with any sort of recharge bonus have been updated to reduce the recharge time of all spells with a chance of 20% instead of the attribute-specific bonuses they had previously.