It's a matter of taste really. Consider that wizards as written have few offensive spells beyond the at will fireball and lightning and they must pass a health/con check each time they cast them. The chief wizard in my campaign does often end encounters quickly, but not always! and many encounters occur at distances too close for him to use the spells at all without frying himself and companions in the process.
However, the supplement, does contain a rule for "taming the wizard" and compensates with additional offensive spells for those so inclined.