Sorry nezwek but the reason they're disagreeing with you is that what you're saying is simply impossible.
Ripping by itself does not degrade video quality at all since the video (and audio) is absolutely identical to the original.
Perhaps I'd better explain further.
There are several steps to copying a DVD to DVD-5 and I tend to find that "all in one" programs blur these boundaries in users minds.
To elaborate these are ripping, post processing, compressing & burning.
Ripping is the combined process of decrypting and transferring the files to hard disk. These files are identical in quality to the original since they are essentially copies of the original files but with only the copy protection removed.
Post processing is an optional step where you can remove titlesets etc. or edit the menus and command structure of the disc prior to compressing.
Compressing naturally enough reduces the files to a required size (frequently DVD-5 but not always).
And most obvious of the lot, burning, which records these files to a blank disc.
Even in "all in one" programs these steps still happen in sequence but because they're carried out as one sequential process it's not always as obvious whether compression has been carried out or not.
All programs rip at original quality then process the files according to the settings in the software.
If there is a difference then it has to be as a result of these settings.