I never understood that complaint about Pike's situation in the pilot, nor did it ever bother me when watching the episode. What's more, it doesn't seem to have been a terribly unusual hook for introducing a lead character. In the first episode of Adam-12, Malloy is in a funk, ready to quit the force, and unwilling to take a rookie under his wing because he'd recently lost a partner. Did it sabotage his character? No, it made him interesting.
The difference with
"The Impossible Mission," the
Adam-12 pilot, is that the world knew it was a
Dragnet spin-off about two patrol car officers, so no matter how Malloy was presented in that pilot, there was no risk of the formula being disrupted, and by episode's end, Malloy scolded, then took on the job of being his superior. All problems solved.
Star Trek did not have that kind of lead-in, so it was standing on its own with no expectations of character stability--the kind granted to Webb-stamped
Adam-12's Malloy and Reed, or DeSoto and Gage from
Emergency!
Pike's story was a stand alone, so how Hunter presented Pike was either hit (getting a desired look at what would come if it went to series with Hunter) or miss (ultimately, not what was going to carry that kind of drama and be appealing to audiences). So, unlike spin-offs that were already advertised as another Webb production featuring the contrasting, but bonded duo formula already proven with
Dragnet,
Star Trek's captain had to be more--even in a story where he struggled.
Shatner not only delivered with the many emotional changes demanded of WNMHGB, but was able to build on that with his personality in stories so removed from Pike as a character early on (think
"The Enemy Within," "Miri," "Dagger of the Mind," "What Are Little Girls Made Of," etc.).
All actors cannot portray all characters, or are right to carry a series. For example, Lyle Waggoner screen tested for Dozier's 1966
Batman, but lost Adam West. In the Waggoner screen test, he's flat, and delivering it sans any attempt to bring so colorful a character to life. On the other hand, West--in and out of costume, keyed in on Batman having a greater heroic purpose without even doing anything visually heroic. He just worked, and its no surprise he won the role, and would go on to easily justify why he was the right choice for the series.