vedio quality - captured from DV type

I just wonder is anyone aware of the quality captured?
I tried all kind of methods mentioned here, but it seems didn't work well
for me.
I heard maybe my problem is my DV camcorder is kind of old(I brought it from
1998, JVC DV-GR3), someone told me that the driver inside my camcoder might
not fast enough. But few days ago someone posted here said his SONY
camcorder had some problem. So I just wonder if all the DV caputer has some
problem?

Thanks,
Jacky