It wasn't that bad for me back in the day, it probly gone to shit now but back then i found them pretty good. I use taiyo yuden now just to be sure to have good media as nowadays i could afford it.
I've always used the cheapest and most nasty cd-r's I could find and have never had a problem, and this goes for other platforms such as PS1 etc, I may have had one or two fail in the burn process but if it burned I certainly can't remember ever having any problems
I have been using memorex for a while on my DC. They work fine (they just scratch VERY easily). As long as you take care of the disk, it shouldn't be a problem. Atleast I haven't had any. (REV0 US)
I use Lightscribe discs and haven't had any GD issues with my current DC, I find if I use a DC from storage that hasn't been used for months they sometimes play up until they've had a couple of games used in them, weird eh?