Why would somebody play an non-caster?

[Kudaku]

However, mundanes even suck atbeing a challange, since you only need an horridly built wizard(barr Conjuration, anybody?) to create a liability,

I seem to recall a quote about how casters beat martials at everything, including sucking.

Something about how fighters can just stab themselves while wizards can banish themselves directly to the 9th layer of Hell.