A very good Question?

I've been looking at some of the post's on the board and notice every one winning about "Patch This" "Image that" and i was just wondering....
Are all of these problems mostly related to downloaded images/games/isos?
I ask this because I have been renting psx games and just copying them with nero and they seem to work fine.
I dont tend to have very good luck with these kind of things and my burner isn't very good soooo... Am i just lucking out (for some very strange reasone) Or are there not really any problems with just doing a cd copy (original to cd-r). Also could someone please say the most common problems (if any) for backing up original psx games? Please answer as many questions as possible. You can also email me at whatdoisay**********com.
Thanx in advacne and have a merry christmas or whatever!