Netflix video quality sucks on browsers anyway – at least for movies. Half of them seem to be limited to something which could only be described as "less than DVD quality", some noticeably so. That's the reality for the paying customer – for a “pirate”, most of the movies in HD quality are a quick web search away, without needing to install any programs.
If you're looking for quality, you want to go with a Bluray, not a rip.
Netflix, however, at times doesn't come even close to that, with the video bitrate often hovering just above 1000 kbps in browsers.