will allow you to connect the camera as a playback device that looks just like a VCR or DVD or other playback device. If your avermedia tv card allows you to connect external analog sources like that it will work. It will be analog, standard definition video, with no control of play, reverse, fast forward or any other camera controls available.
If you really want to do this, might I suggest that you investigate the Sony DCR-TRV280 Digital 8 camera? You may need to add a FireWire port to your computer, but the video transfer will be digital and the computer's video editing application will be in control... and that digital transfer will provide a better video image.
To answer your question, regarding various quality comparisons: