When the audio quality is rated all of the audio tracks are taken into account. Dolby Digital 5.1 is the standard right now. There is an astronomical difference between 5.1, 2.0, or even 1.0.
Every aspect is considered before the video quality is rated.
Aspect ratio is usually not taken into account - we judge what is provided. The quality of presentation is the primary focus. The menus are judged on several factors. Everything from ease of use to how well do they suit the movie is considered. Since DVD-ROM content is uncommon at this point the rating is based on entertainment value.