Been trying to stay out of the conversation since the problem has been solved for me, and I didn't want to gloat.
But in re: the Super HD vs. HD issue, I have a 720p AppleTV hooked to my 720p TV, and a 1080p AppleTV hooked to my 1080p TV. One gets SuperHD one does not, obviously. When I was having this issue it was happening equally on both TVs but not on my PC (which also doesn't have super HD.)
Based on the volume of posts in this thread lately I have to conclude that the core issue being reported initially, that AppleTV devices had significantly worse quality than other connected devices in the home, has been solved for most people.
I really sympathize for the rest of you but I think what you are seeing is a very different issue, especially those who see bad quality across non-AppleTV devices. What you are seeing is probably a bandwidth crunch based on too much usage, and yeah if your neighbor is pulling SuperHD it could affect you negatively if your local node is oversubscribed. But that wasn't the issue being reported here.
Perhaps it would be better to start a new one for Netflix streaming issues that affect all devices in the home not just AppleTVs.