I knew about Korby the moment Brown turned to be an android so I can't say this episode was much of a thrill.
Ruk was ridiculous in that costume and makeup, even for this era.
The KissMe/SplapMe scene seemed pretty pointless as it proved absolutely nothing.
Correct me if I'm wrong, but this marks the beginning of the disposable crew members whose death are totally meaningless and devoid of any interest or sympathy from the audience.
On the plus side, I liked the banter between Kirk and his android self. Also interesting was Spock's saying he was dismayed when Kirk indirectly called him half-breed. It is almost as if he admitted he could be offended, which is a human emotion.