never watched a lot of TOS, but weren't they basically at constant war with the Klingons throughout that entire period? (if I'm not mistaken, it wasn't until the sixth movie, when Praxis explodes, where the federation and Klingons start talking peace, if you follow all the shows/movies in the correct timeline). Just my 2 cents here, but I think it was probably more a matter of budget constraints that prevented more war/battle scenes in TOS than a desire from Roddenberry for a happy/utopian type of show.
I've always thought that DS9 had the best character development of any of the shows (TNG is right there as well). The good guys weren't always good, the bad guys weren't always bad.... just made it more realistic (I know not everyone likes that, but we're all different).
The "universe" we lived in when TNG, DS9 and Voyager came on the scene was very different than the one we lived in the '60's, when Gunsmoke and Bonanza still ruled the airwaves, Vietnam was raging and nuclear annihilation was ever-present. TOS was presented as an antidote to the "gloom and doom and inevitable destruction" feeling of the times - even though times are bad, we will survive and thrive.
I saw an old special about the making of TOS that inteviewed Gene Roddenbery & Majel Barrett. Roddenberry said he purposely created Star Trek to have an optimistic future so that we'd be able to look forward to the 23rd century.
As snykymom mentioned, TOS started in 1966, after the country was still reeling from Kennedy's assassination and the Cuban Missile Crisis. The Russians, Cubans & the Chinese were all our enemies and threats were very real at the time. The Vietnam War was killing our men, with no end in sight.
While the Klingons & Romulins were the enemies, if you look at the
Star Trek, Roddenbery created, it's not just the United States, but the United Federation of PLANETS.
Earth had done away with all war and planetary conflict. There was no more poverty or disease. People didn't have to work at menial jobs, wasting away their lives and talents for money. They did work that enriched them and contributed to the planet & the universe.
At the helm of the Enterprise, there was a Russian and a Japanese officer, they were no longer our enemies.
At communications was a black woman, who was also a lieutenant, not a slave nor forced to sit at the back of the ship or to drink from a different water fountain. Whoopi Goldberg said when she saw Uhura sitting at the Com, she wanted to be just like her. There were no positive images and role models back then, or strong, black females. The role of Uhura, in fact, is quite responsible for influencing and making up the woman who is Whoopi Goldberg, today.
Uhura & Kirk had the first interracial kiss ever on TV, and that barely got through, only because the aliens "forced" them to kiss.
TOS wasn't made out to be a Utopian universe with no conflict or enemies. That wasn't what I meant. It was very ahead of it's time. It was controversial & thought provoking in it's day, while still maintaining a positive, optimistic outlook about a future to look forward to and about reaching the stars where no man has gone before.
DS9 was just 5(?) seasons of bickering and strife, both internal, among the main characters, and externally with their enemies.

While some people may be interested in tuning in for that kind of stuff, it is not in keeping with GR's vision.
If you look at the crews of TOS and TNG, and their tight, tight relationships with each other, they are the kind of crews I know I would fly anywhere in the universe with and be proud to serve with.

If I was a character of either crew, I'd risk my life for any of them.

Yes, there are times when the needs of the one outweigh the needs of the few, or the many, and to Hell with the Prime Directive.
Maj. Kira, I wanted to shoot with a phaser every time she went into one of her huffy tirades - which was every show.
I would never get on a ship with Scott Bakula as captain.

Apparently not to many other people did either, as the series ended.
However, I was watching the movie last week and decided to listen to the commentary track. JJ Abrams says in the movie, "Oh, and a bunch of people seem to think the Kobayashi Maru was from the original, but we made that up" or something along those lines. I was flabbergasted. I mean, no, it was never actually shown on the original series or the sequels, but it was mentioned (in both the series and in novels based on the series, yes?). Am I crazy? Did I perhaps misunderstand him? I need to listen to the commentary track again, I guess.
I don't know what JJ Abrams was referring to. maybe he meant in coming up with HOW Kirk had cheated?
The Kobayashi Maru was a vital part of the plot in
The Wrath of Khan. There is a whole scene where Spock is explaining to Kirstie Alley about how Kirk was the only one who passed the Kobayashi Maru. Spock said he never took the Kobayashi Maru. It was developed after he was already a member of Star Fleet.
Later, when Kirk's son asked Kirk how he passed it, he said he cheated. His son said "So you never faced a no-win scenario. You've never faced death?"
It was
Spock who actually came up with the answer to the Kobayashi Maru scenario and saved the ship.
