Not sure about the first two. Might be that your player doesn't do DL DVDR. Strange that it tries to and can read the file structure, though. edit: doh, you said DVD-RW, not DL. Yep, seems your drive wants to play media files from DVD-RW? Does it play MP3s and such? You can try navigating to the VOB files in VIDEO_TS, just for the hell of it. Otherwise, try to get the disc copied straight to standard DVD-R.

The video quality of the DVD5 of Harmy's RoTJ that is floating around is indeed very poor. I believe it was not encoded directly by him as were the other two films. It has a plain menu that pops up and then very pixelated video. His actual AVCHD release is pretty decent quality, but lower than all the >1.0 releases of the other films. I'm not sure that it can withstand re-encoding to MPEG-2, so you might want to just wait until the next version comes out or find a way to play the AVCHD file.