LOL. This is really an ANCIENT discussion. It's as old as illarion itself.
If you had read anything about the VBU, you'd not have started it again.
Athian and robert have some really useful hints there.
As soon as a fighter gets close to a mage, the mage is down because he cannot concentrate on stronger spells when being hit.
Good mages with lots of mana, high skills and maxed mage attributes (which means they really suck at EVERYTHING else but magic, especially fighting and defense) can be able to outjump a fighter and trap or kill him when they don't have any lag.
But if you want to take down a mage, alone from arrows and throwing stars the mage won't be able to concentrate.
A mage makes sense as a team supporter, in pvp a good mage can tare through one or two better fighters before his mana is out (but needs ten to fifty times more training time than a fighter does), and against three well-prepared normal skilled fighters with good equipment and perhaps a few potions a better mage has no real chance. Even IF the mage has good equipment.
A fighter may need an efficient mage as team partner for hunting bigger monsters, usually. But in player versus monster, the mage cannot carry much loot away, and fighters are closer to the valuables, so playing mages in pvm may end up annoying if you don't go with really fair people.
Anyhow, after the VBU, playing mages might suck even worse than it does now. Perhaps not. We'll see.
Read up the forums, re-starting ancient discussions that have been done over and over again doesn't make much sense.