Last night, running my little 4th Edition D&D game, I noticed something that I had suspected would be the case. The Warlock blew through all of her Encounter powers and never made a single successful attack. Part of this was because the encounter was scaled to test how much the PCs could handle, but the fact is that the attack bonus for Warlocks and Wizards (and Clerics as well) is 2 or 3 points lower than those for Fighters, Paladins, Rogues and so on.
The reason for this is that classes using a missile or melee weapon get a proficiency bonus with the weapon in question, either 2 or 3, added to their attack values, whereas the ‘pure casters’ do not.
This means that for melee/missile classes, their attack value is around: Ability modifier + 1/2 level + proficiency modifier,
Whereas the casters only get: Ability modifier + 1/2 level.
If your game is low-level, without many magic items, then that proficiency bonus is going to be a huge difference. In this case, it meant the Range hitting all the time and the Warlock only hitting once, with her Daily spell.
So, I instituted another house rule. Warlocks get a proficiency bonus of +2 for using either the wand or rod that they have as their arcane implement, and Wizards get the same proficiency bonus for whichever implement they choose to focus on as well. I realize that the Wizard’s AoE spells especially can be quite powerful, but they also have fewer hit points and less armor, and making it so that they hit significantly less often as well just takes a lot of the fun out of the game in my opinion.
So, in theory, the next session should be a lot more exciting for the Warlock, and I imagine the Wizard will also be a lot happier.