It just doesn't work for me.
Once I add in Favored Spells and the Prayer Ability to the Cleric whilst giving the Fighter Weapon Specialization... that they are somewhere near equal. Equal enough for me at least. At lower levels the Magic-User should be equal to a Thief Xp-wise, given how useless they are initially... and then ramp it up when they start getting "real magic." That said, my houseruled MU has the Arcane Lance and the Long Casting Abilities so they are useful at lower levels... thus I will keep their Xp requirements the same.
Thoughts? Random criticisms? Rage?
I know my house rules aren't very popular but I'm okay with that.
