I have a bad internet connection (1.5 Mbit) and found that without using the whole connection I wasn't able to stream netflix and was still burdened with artifacts and terrible quality. Now to put this in perspective at a little over half my connection speed (~.8Mbit maybe it is less) amazon streaming works perfectly with decent enough quality and no stops to buffer or recheck my internet speeds.

So maybe I'm in the minority or maybe I'm not but I dropped netflix streaming and probably won't be going back unless cable or fiber internet comes to my area.