Generally, High Wizard is not considered to be an MvPer. They deal good damage AoE but are outclassed when it comes to single-targets.
Plus, they have fixed elements, meaning they can't even damage some MvPs, and very low HP, meaning that they die very quickly (even with Energy Coat and a -30% shield (and remember that some of the better caster weapons are two-handed)).
As a supporter, Wizards are godly for keeping the mob at bay, or even eliminating it every time they respawn, but for soloing you should consider a carreer change.