I purchased a new D7000 in Feb 2013, I then waited for some good weather to take photos , this was about April. Oh Dear ! it was disappointing , out of focus using single point / single focus at anywhere approaching Full Aperture and speeds above 150th Sec. My 3 main Nikon lenses were all the same but were perfect on my other Nikon bodies (D70,D90 & my wife's D3100). I read lots of comments on this site saving "it is the user" and how wonderful the D7000 is. I found that depth of field could be discounted as pictures were still out of focus on a vertical target, all lenses showed back focus. I sent the body to Nikon Service UK , received it back within a week and now the focus is absolutely spot on with all my lenses. During the testing prior to sending to Nikon I found that AF Tuning of around -15 to -20 was required for it to correct the focus issues. What I think this shows is that there are still D7000 's being sold with this issue after a couple of years of manufacture, mine was purchased from a relatively high stock turn-over camera specialist shop so I believe it is fairly recent manufacture. If a camera doesn't focus as it should and you have tested it using a sensible method, send it back, after all they are not cheap items and should be able to take a photo in focus just a easily as a D70, D90 etc. Anyway, mine is OK now and I can go and take photographs now and use the camera for the purpose it was bought. Not just trying to see if it functions correctly .
We may not be as experienced as some of the experts here but also we are not silly, if you think your D7000 focus is faulty it probably is.