I agree that we will probably find out more about what happened to the Hood’s engines in later episodes. Perhaps the refit engines were installed out of some necessity to correct a potentially fatal design flaw.
I loved that this episode tackled the issue of women captains head on, although I am slightly relived that Garrett did not get the job as she appears to have some deep issues that needs to be worked out. Besides, who would want to inherit a ship full of corpses anyway!
For me at least, it's hard to believe that the Federation would intentionally discriminate just to please one member race. That being said, whilst it is hard to imagine today that such discrimination would still exist in the 23rd century, this is 1960’s Trek and the future is not perfect.
The topic of positive discrimination a very current issue. As Kirk asked, “Do you believe that a person should receive special consideration because of their gender, religion, race?” Is it really right to hold to a policy of favouring individuals belonging to groups which have historically suffered discrimination, even if someone else is more qualified? Hopefully we will one day have no discrimination, either negative or positive, and that everyone will be treated with equal opportunity.
Also, did Spock just get caught out lying, well at least to himself anyway! That scene cracked me up.
Overall I really enjoyed this episode.