While I think the 103 has a very slight edge in Netflix image quality over my PS3 (only when using HDMI 2 set to Source Direct because there are too many motion artifacts on any other configuration), I've stopped using it for streaming due to its inconsistent behavior. It's annoying spending the first 5 minutes of any show watching the streaming quality bounce back and forth from SD to HD and hoping that it will settle down.
I think you've really hit the nail on the head regarding posts here on the forum that state the 103's netflix streaming is subpar. Aside from the issue of the 103 taking a bit longer to reach full highest bitrate quality (when available), most people run their player through hdmi 1 for netflix without knowing about the differences between hdmi 1 and 2. As has been reported by others here on the forum, hdmi 1 has the qdeo noise reduction processing on at all times, which produces some noticeable smearing/blurring on netflix scenes with high contrast and quick motion. It's not always obvious, but it's there. I think this smearing makes people see the quality as subpar compared to other streamers. Unfortunately, the only solution is to use Hdmi 2 to eliminate the blurring.