Sure I have a better means to test these things, but in addition everything filters through me, so I need to balance my time, the more you can provide the more focus can be spent on correcting the issue(s) rather than figuring out where they are...
So I guess it would be good to understand where/which class you guys are feeling the most pain against... And I think the only way you can attempt to make a fair judgement is a pvp contest with no pots... A single wiz is never going to beat a warrior who is potting... They never have 1v1...
My opinions off the top of my head how I think pvp with a wizard should pan out (baring in mind no pots):
Wizard v Warrior: Wizard should win with enough time, chuck a cheeky, fbang/icestorm/firewall down to slow the warrior, and FC/FD, if the warrior is skilled enough he will be ShoulderDashing/BA'ing to try and catch you, not senselessly chasing the wiz in hope to get a lucky tdb (#warsgotlazy). 6/7 out of 10 for wizards if in a fair non potting pvp.
Wizard v Taoist: I see this as being an unlucky one for wizards... as a Tao with two pets, specially Deva equates to a tough time for a wizard, however, a good enough wizard can TU their pets, keep mirroring out to slow the tao... But to what end? a Tao will just heal up and start over... 9/10 for taoists.
Wizard v Sin: I see this is being relatively fair... and Sins giving wizards a bit more of a run for their money than warriors as 1 wizards wont be able to slow down a sin with swift feet and two sins can get lucky shadow steps to them... However the mechanics of the pvp is the same, run and lay down some mass spells, using a single type spell against a sin is going to land you on the floor (you won't have much time to miss). 5/10 for wizards...
Archer v Wizard: This is where I could potentially see a problem, however, archer has a lot less defense than a wizard with shield, but does make up for it in damage... I see an archer winning this one more often than a wizard maybe 8/10 for Archers....
This has ended up being the mad brain dump of a crazy scientist, sorry.
Sam