I just don't think it is worth trying to parse out the e-era updates. You could ban the classes, but why really even bother? Truthfully its a tossup if the Mage is actually better than the Wizard (it gets some better things and some worse things, but the powers all work for both, so who cares really?).
Truth is the stuff will all work. There are a few slightly 'bad' classes, like the Binder, and perhaps for certain niche setups something like a Slayer can be pretty optimized (but it will still be crappier at high levels no matter what).
If you don't really want to use E-Classes AT ALL, then I'd say just ditch them, but keep the new feats! The Essentials Expertise feats BTW are fine, they give you some sort of new option, PLUS the attack bonus. So, every PC will eventually pick one, but they do have a meaningful choice.