I am not quite sure but C2 errors on a data cd are not critical as there is one layer above doing additional error correction, but it may result in slowdowns. On an audio cd or [[r]s|m]vcd i fear the c2 error level is too high. It should be lower I guess as a CD written @16x is not too fast.
Of course the error reporting of that samsung drive may be faulty - you could try to do a "raw reading" of the disc with Nero CD/DVD Speed (I think it can do it) and watch the transfer rate.
EDIT: As soon as I have my new Benq I will test some CDs and let you know what they look like.