The last year or so (starting a bit before Essentials) has been spent trying to re-balance 4e to make it a little less objectionable to old-schoolers.
The wizard is being incrementally beefed up, getting more powers with every new product. Non-controllers are seeing their control nerfed to make the wizard better by contrast.
The old-school thief was whimpy, but with good skills, so the rogue has gotten mildly nerfed.
The old-school cleric was mostly about healing, so the cleric's non-healing (especially controllerish) things are getting nerfed. When there was a hew and cry over the extreme templar nerf they backed off a bit, and Battle Cleric's Lore came out by way of compensation (not quite the old self-buffing cleric, but quite the bad-ass).
Things have generally been getting messed up for a while now. I think 4e was probably better prior to the PH3 and Essentials than it is now.