Those are going to be fighting words here.
Honestly I have used 4.4 and 4.4.2 on many devices and I have not noticed frame rate or stuttering issues. the same can be said for iOS7, I have used it on older phones and ipads and it runs good. People complain about "lag" and "stuttering" all the time, personally I think we are past that. If I ever see it, it is so minimal it doesn't hinder the user experience.
Well it's certainly there I see it every day almost... try going to the screenshots on apps in the App Store and open them and see the dropped frames as well as when you pull down spotlight search on the home screen...it may not hinder usage but I can't imagine that's something that Apple wants for iOS 7 and it sure is aggravating and goes to show how unrefined iOS 7 is.
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