Prog makes .MPG files - any good?

I've got a DVD player prog that includes, it says, a DVD copy utility.

So I clicked on it and it happily started processing a DVD I had in the burner.

It produced a list of 60 .mpg files and I find I can play them in Windows Media Player.

There's 6.34 gigabytes of them.

Are they any good, would you guess, quality wise?
What can I do with them as far as burning them to media? And how would I do it?

regards,

ab