Tony Vargas
Legend
You can probably do a lot in the realm of DM judgement (rulings not rules!) without resorting to any sort of formal overhaul. It's fine your to decide that a monster believes an illusion and reacts appropriately, for instance, details of the spell in question notwisthstanding.Basically, I'm left wondering -- am I missing something in regards to the power of the Illusionist (as compared to other Wizards), or is this arcane tradition in need of a home-brew overhaul? And if you recommend an overhaul, do you have any ideas to increase their power or player attraction?
As long as there are enough opportunities where illusions can be used effectively, the the player of the illusionist shouldn't feel his character 'too weak.' Setting up the right mix of situations for him (and everyone else) is up to you.