To be honest with you, It is very useful for certain close ranged skills and it's a supposed to be a ranged class in Cabal, but some large AoE skills close and around the Wizard also supposedly make it more difficult or need to be more cautious to approach a Wizard. In BM2, WI has the largest maintainable AoE compared with all the other classes.
Regarding the defence, WI has the most vamp capabilities, especially in BM2, because you strike twice with large AoE. Vamp to Defence in PvE. In PvP, use your damn mobility that's given to you in the form of Blink and try keeping your opponent at a distance! Stop standing there like a moron and complaining about not enough range. You got enough range 8 skills to chip away at an opponent HP Cabal Alz.
You can keep Burning Hand skill Cabal Online Alz, to be used to make you walk but than quickly press Dash whilst in combo, making you have more mobility even if opponents are within range of cannon or lances. Overall, Wizards are in fact a mix of both ranges, but you can't specialize in both areas. But the closer to the opponent you are in BM2, the higher damage skills are availed to you. Unlike the FA, regardless what distance, damage is the same.