They should have used Gary Mitchell instead of Khan
"Wrath of Khan" was a hommage and a sequel to the TOS episode "Space Seed".
If they really wanted to pay hommage to an old TOS episode ,like Nicholas Meyer did with "Wrath of Khan", they should have picked a different one, like the season 1 episode "Where no man has gone before".
Gary Mitchell would have been a great adversary for Kirk, and the story of this episode was quite compelling, too.
What do you think?