Setting aside the wider problems casters face, I'm mostly bewildered bard and cleric have actually relatively good feats and fallback patterns (assuming you picked a deity with a good focus spell, for cleric) as far as spellcasters go, but wizard is STILL just kind of fucked on all those fronts. Wizard feats blow ass and it starts to feel like spell blending and spell substitution should just be built into the class for how much the defenders ride those thesis's dicks, and I cannot even start on schools.