I did a install with a partially broken disc2. Whenever there was
a error, anaconda correctly detected it and
displayed a dialog, which said there was a media error (or the file was
missing).
I was able to install a few RPMs by retrying a few times,
but a few just couldn't be installed.

I was able to continue this by ejecting, placing disc1 in the drive,
waiting for it to skip a few rpms, ejecting it on the fly and putting disc2
back in (the door wasn't locked, fortunately). At one point I let it try
accessing the disc while the tray was open and that confused the kernel
enough that it decided that my cd was completely empty, making it
impossible to ignore further packages. Oh well :)

Ideally, I think it should have a Abort/Ignore Package/Retry dialog instead
of just
the "Ok" it now has (which means Retry, really).