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I seem to be getting a lot of SCSI erros on certain DVDs

Example:

Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading 'DVD+R-DL hp CDDVDW TS-L633R 0400' at offset '32768'


Does this mean the DVD is bad? I do get these on some DVDs but others are fine.

There are some issues like this and so far, it is caused by damaged or dirty disk. Some of them are from manufacturing when errors are pressed. Try cleaning the disk first and see if it makes a difference.