The mage class at the moment has very little mobility, and only a few meta spells.
Its hard to get away as mage, with all the slows atm(crippling for an example) and they are put far behind from other classes.
What you could do is:
1. Add blink (normal for custom twink servers aswell)
2. Add counterspell(this is needed if they want to be able to do as well as locks, and also adds another skill level to the mage class, as it can easily be fake-casted, by other players)
3. Shatter, the shatter talent is what makes a frost mage a frost mage. You receive 50% crit chance to frozen targets.
Also rogues can kill people in a second atm, because of OP dps of weapons, and the weird speed of weapons(long swings deal more dmg, making stuff as sinister strike hit for high amounts)