Like SusanK said, "try it before they knock it" doesn't really work as there is no way to just try it. Commit 100% permanently before you knock it is more accurate.
iOS 7 may be beautiful to some, but an eyesore to others. There really isn't that much new over iOS 6 anyways in terms of usable features. Control center is decent, activation lock is probably good. Personally, I like the new Safari app (but that is my opinion only).
On the other hand, iOS 7 introduces large touch response delays after every animation, kills the Music app for many, has many more instances where it is more complicated to use, and is full of bugs affecting battery and stability (although your experience may vary).
If it weren't for the delays in touch response (I've often typed 3 letters of a Message before it starts registering, causing me to have to back up and start over), and the terrible Music app, I could forgive some of it more. Certainly can't blame others for wanting to revert back to iOS 6, especially given how long the bug fixes are taking.