By default RottenTomatoes pages uses base 10 rating for TOMATOMETER and base-5 for AUDIENCE SCORE.
This script changes the latter's base-5 to base-10, and modifies both relevant tooltips, in order to be perceived more easily.
It modifies these 3 elements:

• appends the descriptive text (=6 stars or higher) to the text of the TOMATOMETER tooltip,
• modifies the text, from 3.5 stars or higher into 7 stars or higher, inside the AUDIENCE SCORE tooltip,
• multiplies x2 the AUDIENCE SCORE Average Rating.

Note 1: since v2 the script modifies the elements immediately after they are displayed (not after page completely loads).
Note 2: this script uses the setMutationHandler function (by wOxxOm)

Hosted in GitHub