Is it a utopia? On earth and in the federation they make it seem so, at least post-scarcity but at the edges of the federation you have Romulans, the Borg, Cardassians. Multiple main characters undergo torture, etc... It would make an interesting TV show / spin off where people are shuffling / politicking for power in a post-scarcity world.
we can pick it apart forever. Who gets the penthouse or the beach view property and who lives in the basement? Replicators will not solve all the reasons we have money today. Maybe uploading into cyberspace will but where you can have every place and every thing, though I'm sure someone will point out how that won't lead to utopia either.
I don't want to attempt to classify the entire franchise as that, or even Starfleet in its entire story arc.
But if we examine TOS and TNG, I could say it represented a "roving utopia" model where Utopia Meets Reality. The episodic nature and self-contained stories would typically examine the question: "what happens when the Roddenberry philosophy comes into contact with something unique?" and it would be a study in anthropology, comparative religions, or sociological questions.
I hadn't watched much Star Trek in the 1990s, but I was becoming excited about Babylon 5. One of the main points of departure was the planning of the 5-year story arc, and the character development that accompanied it. Every character in Babylon 5 was imbued with an origin, a narrative, and a destiny. Jumping into the story from the beginning, and riding along for all 5 imperfect years, it felt like we also had a destination, and threads came together, and there was resolution and revelation. The Babylon station was never a utopia in reality, only in its aspirations.
So I cultivated a disdain for Star Trek as it was in those days, but Trek was a product of its time, and had helped to cast the die for episodic and self-contained "Monster of the Week" type shows. However, I've rewatched all the films, and I commend them on great production values, acting, and interesting themes. The Star Trek franchise has grown to include something for everyone, including the Klingon-language performance of Bonnie Tyler's "Total Eclipse of the Heart", which definitely captured my attention.
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The utopian bits were never really explained, either.
They mostly just said it was all great and fair and nobody needs money and is somehow trying to be their best selves… nevermind the numerous examples to the contrary.
They weren’t really post scarcity. They never explained how they’re not in a constant state of rioting when a weird government/military decides what everyone can have or do.
You just go with it, because that’s the backdrop. You have to suspend disbelief and just enjoy the story.
But also, Picard is the best Captain, by far.