Dumbest idea ever. You are composing some text in a form, or filling in fields. You want to scroll up just a little to see something out of the viewport. Oops, your little swipe is misinterpreted as a refresh gesture: the input is gone.
I think what "poorly implemented" actually means for touch screen gestures is to be lacking the customizability to reassign or disable infuriating behaviors.
Gesture configurability is nonnegotiable: when implementing gestures, have the configuration system in place first and make sure every single behavior is tied to a preference.