Stephen Hackett writing over at 512 Pixels:
With iOS 5, Apple introduced Notification Center, the pull-down shade that houses missed notifications and messages all in one place.
With iOS 7, Apple added Today, a section of Notification Center that users can fill with first- and third-party widgets, as well as Control Center, a quick way to get at commonly-used utilities with a flick up from the bottom of the display.
I don’t think this has aged very well, unfortunately, and it’s mostly Control Center’s fault. In addition to it being confusing to have a hidden panel at the top of the screen, having one at the bottom too is a lot to handle for some users. But there’s a bigger problem in my mind: Control Center just does way too many things.
I agree with Stephen on a few points, particularly in regards to improving Control Center by making it more customizable.