Excuse me for my average english but
I just want to share to you my experience regarding my 32" EH5300r AH01 version. I used to watch upscaled DVD movies on my dvd player and thru All share play. I got a 1080p BR copy movie with a lot of CGi effects on my External and played it thru all share play. While watching, I noticed a lot of motion blur, ghosting effect or movements leaving traces which are very noticeable. I tried to adjust all the picture mode settings but still the same.
I was pissed off and was planning to sched an appointment to Samsung.
Then I saw the post regarding ghosting effect while playing games. I didn't tried this before so I connected my laptop thru HDMI and started playing COD3. I didn't find anything wrong compared when I was watching the movie. I had more fun playing because of the higher resolution, 1080p than the native resolution of my laptop which is 1366x768. Also the tv displayed it in superb quality. (my laptop specs are i5 2.7ghz + Ati Radeon 5870 HD 1gb ddr5, 8 Gb ddr3 1366mhz)
After that, I opened the movie on my laptop on VLC player. This time I didn't notice any ghosting effects or movements leaving trails/ traces. motion blur is only during very high speed scenes which for me is normal only due to the 60hz refresh rate of the TV. this is really a big difference than watching it before by USB all share play. I tried to compare the scenes by switching the sources to HDMI to USB and see the difference. It's actually better on laptop thru HDMI than the built in media player of samsung. There is no doubt since my laptop's hardware is far more advance. I enjoyed watching the movie than before because of high resolution and very good PQ.
After this test I appreciated my TV than before, It's not only the panel that affects the quality but also the built in hardware and it's capacity inside the TV. The components are average maybe, just to perform effectively but in an efficient way. If some people in here already tried this before then its your panel which has the problem.
My observation is when an external media player is connected to the TV like BR players, laptops etc. These players have its own processors and sends the HD signals thru HDMI to the TV, the TV receives the signal then reprocesses it to enhance the image quality based on your chosen picture mode then displays it on the TV. if I wish not to enhance then I can select game mode available in HDMI source, to bypass the TV's built in processor.
If I used the built-in media player in my TV, it may not process the media properly since it is already busy running the application plus processing the images at the same time. Consuming more memory which compromises either each or both process. Plus the options for adjustment are limited.
My conclusion is its a hardware limitation that causes poor quality but for me I'm still happy using this TV since it gives me great enjoyment.
I can say it's a good buy already.