Yeah there will be times when a simple tap will cause a slight scroll and sometimes when it takes 2 or 3 taps to register just a single tap. Especially when clicking an app icon to open.
Also in browsers more often than not when double tapping a text area to automatically zoom in, it'll either not happen at all or click a small link in the area, causing me to have to hit 'back.
I still like the phone a lot, but the touchscreen over-sensitivity/lack of sensitivity can be very annoying.