The eternal question: which heroes are better, mages or warriors?

How can you do without intellect? You need to cast spells 2 times a week (if you still have the Dimension Door spell, then 1 time?). And you need at least 3 schools, both magic and wisdom. This leaves you with 3 more skill points. You can take magical skills from the 4th school, mysticism (by the way, if you're a Necromancer, you'll only have 2 skill points left), or take something from the warrior skills.

And where is the balance here?