It's not fair to judge picture quality of anything, let alone porn, (which has been played, probably, several hundred times before you got it...) from a rented videotape... to properly judge picture quality, get a new DVD!
Yes, the sex comes somewhat slow - but there are cultural references to compensate for that, and Ms. Carrera does her own piano playing - in addition to acting, and co-writing the picture.
Ms. Carrera (now retired) rates this her favorite among the porn movies she made. I add that it was directed by her husband at the time, Bud Lee.