Star Trek: "Assignment: Earth"

Data
Title: Star Trek: “Assignment: Earth”
Year: 1968
Network: NBC
Episode: the last (of twenty-six) from season two; 50 minutes
Creator: Gene Roddenberry
Director: Marc Daniels
Writer: Art Wallace; story by Wallace & Gene Roddenberry
Starring: William Shatner
With: Leonard Nimoy, DeForest Kelley, Robert Lansing, Teri Garr, James Doohan
Music: Alexander Courage (theme)
Cinematography: Gerald Perry Finnerman
Editing: Donald R. Rode
I saw it: on video and TV several times, most recently a couple days ago (have on DVD)
Synopsis: a secret agent is sent from an alien world to save Earth in 1968

My reaction
Concept: Would have been a fine concept for a different show. Why is it a Star Trek episode?
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Subjective Rating: 6/10 (Okay, ). This week on Star Trek, Captain Kirk travels to 1968, where he watches a failed Gene Roddenberry television pilot. Also, Spock wears a variety of hats (literally), and Teri Garr wants to know what this is all about.
Objective Rating (Average):