I use my iPad 3, provided by my employer, for use as a digital music reader in my classrooms. The MOST important thing is that the page turns are quick and reliable (tap the screen, the screen responds immediately). Since upgrading my iPad 3 to iOS 7, it has become pretty much unusable. There are times when I will tap the screen, and 2 - 3 seconds go by and THEN the device responds and takes me to the next page of music. I cannot overemphasize what a problem this is, especially in performance to have the music not respond.
iOS 7 has basically made my iPad 3 useless. Unfortunately, there is no way to return it to iOS 6. I really don't want to have to buy my own iPad Air, but it seems that I may have no choice. :-( Not really what I want to be doing during the Christmas season, buying myself stuff instead of my kids. (No, work won't replace the device).
So, perhaps Apple should have not made this update available for this generation of iPads. I've heard from a couple of app developers that the build of iOS 7 is actually slightly different for this particular device, given the hardware limitations in comparison to the newer iPads.
*sigh*