I got the 7 last week as a present to myself and im afraid its going back, the touch screen sensitivity is terrible and sometimes i have to hammer the screen to get it to register. i know its not the same on all Nexus 7s but there are a large number of people experiencing the same issue as i have found on searching forums. An update to 4.4 Kitkat didnt fix the issue either. I remember there used to be a set sensitivity feature in the settings but that seems to be long gone.
Its a shame really as its lightening fast and the screen is exceptional, the big drawback for me is no wired output to HDMI as my TV doesn't have the wireless tech for streaming, and i dont fancy buying a new TV just for that just yet.