I had US netflix on an ATV2 awhile back. besides using a US DNS, (I used tunnlr at the time) I think I had to go into the atv2 settings and set the atv2 to a US adress and zipcode for a fake itunes account if memory serves me correctly. just found a US adress and zip using google. may have also had to "purchase" an app and got around that by purchasing a free app... a bit foggy on the details but whatever I did it worked at the time.
If anyone's interested, media centers, (appleTV, OUYA, XIOS, HTPC, with XBMC (now kodi) is kinda my second hobby.) if anyone needs a hand or has a question concerning that just shoot me a PM.