In my opinion, a good DVD Rip software should meet these standards.
1. A good DVD ripper is a powerful software which can rip and DVD(include protected DVD) to all popular video formats.
2. A good DVD ripper is a easy-use software which has a friends UI and can finish conversion with a few handle.
3. A good DVD ripper is a professional software which can rip DVD with fast speed and great output quality, and has powerful editing function, such as adjust brightness, contrast, saturation, etc.