Thought we might take a break from the nitpicking and fussing, and have a positive discussion.
In your opinion, what's the best part of Trek?
The best part of Star Trek, for me, has changed over time. But the current answer is--imagination (a creative way to say something in popular entertainment) and thoughtful messages. Now, production value has to be there. The words sit on a page until Marc Alaimo explodes in "Waltz" and says "I should have killed them all!" If the cave doesn't look good, then it's distracting, no matter how good the acting. If there isn't a close-up on Remantiklan and Ben Sisko in "Rocks and Shoals," we don't feel the power of their words, their acting, as they battle back-and-forth over whether the Jem'Hadar should abandon the Vorta that betrayed his soldiers. If the make-up isn't capable, then we are distracted by that, when the close-up is done. The production value has to be there for the suspension of disbelief to stay.
That said, the examples I named are from Deep Space Nine--the show about loss and oppression. It is a treatise on both topics. As far as loss--Sisko losing his wife (The Emissary), Jake losing his father (The Visitor), Worf almost losing his wife (Change of Heart)--this tells the stories that when good people are facing loss of something they love, they take dramatic actions.
Oppression--from the race that believes it should be hunted, that there is glory in being prey (I am Tosk), to the Jem'Hadar solider that echoes that sentiment (He has not had to earn my loyalty, Captain. He has had it, from the moment I was conceived. I am a Jem'Hadar. He is a Vorta. That is the order of things.), we can be accustomed to being oppressed. There's the Founders reaction to oppression (What you can control, cannot hurt you) and how that mirrors the Bajorans' oppression at the beginning of the show (They lay down the weapons, invite in Starfleet, and work to re-build their society). There's the political oppression (Cardassians oppress Bajorans, Klingons oppress Cardassians, Cardassians join the Dominion, the oppressors of the Alpha Quadrant, a war breaks out for freedom between the Dominion and the Federation), but DS9 does not leave it at that. A Cardassian lives on the Bajoran station, Jem'Hadar soldiers are slaughtered in a battle they cannot win (feeling for the enemy), a half-Cardassian, half-Bajoran woman lives on the station after being in a forced labor camp, a Changeling discovers his people are oppressors, and leaves his people, but he is tempted to go back, two women try to rekindle a marriage that will get their exiled from their home world, a Klingon is exiled for having honor, and then welcomed back into a new house for having that same honor, a Ferengi marries a Bajoran (with clothes on! Yuck!

), a Ferengi joins Starfleet and loses his leg fighting for those Hu-Mans. People, individuals, criss-cross the political landscape. It's not one person answering for his race.
I chose one show--the easiest to access because the universe is so tight--where the themes are most prevalent. But the imagination it takes to compare and contrast, to continue to run a theme through seven years, especially when ratings aren't great, it endures today. It is relevant because oppressing the Muslims, all 1.6 billion of them, is relevant today. Because making people work for slave wages and saying "buck up and be stronger, work harder!" is akin to saying "Only CEOs make profits for their companies." This show, unfortunately, is timely, today, 20 years after it was on the air. Because the struggle continues.
That's the best thing about Star Trek--having to put the pieces together after watching all seven seasons--by myself, without any help from commentaries and interviews, or coming on message boards and seeing it. Just thinking about something--popular fiction, a book--and using my mind. It gave me something accessible and thought-provoking. It was nuanced.