The Star Ratings assigned to the episodes are determined by the following criteria. Other ratings found in each episode are self explanitory.
Artie disguises-------three for each undiscovered, two for each if Artie reveals himself, one for each discovered by bad guys.
Jim fights-----------three for major winning fights, two for major losing fights, one for minor fights.
Shirtlessness---------two for short times, three for extended times.
Kissing--------------two for short kisses, three for long kisses.
Pike appearances------applies only in fourth season, three stars for no appearance, negative three for appearance.