Kelley was a strong performer, but I would not say he "routinely" acts Shatner & Nimoy off of the screen. Each served theor role, and in Shatner's case, he never ran out of great performances to make Kirk the icon that he remains today.
We all love Kelley, but I don't think he ever acted anyone off the screen.
Shatner is far better than he is ever given credit for. Possibly a silly statement about an Emmy award winning actor? Better as KIRK than he is ever given credit for. To be fair, he's also just about fearless so he has some performances that come off as over the top or silly. But something that never gets said about Shatner's Kirk is his ability to
underplay.
Also, you see all of these characters (including Spock) being "grown into". Shatner was James Whatever Kirk right out of the box in frame one.
But Nimoy... Nimoy's TOS Spock is a recipe that has never been replicated, not even by Nimoy. I think his most interesting performance outside of TOS was The Motion Picture, followed by "Serene Spock" in The Wrath of Khan. After that he started picking up a paycheck. OK, that's very derogatory. He wasn't as nuanced about his role.
I was on a panel with Walter Koenig (sorry, can't help myself) where he said (paraphrase) "Anyone could have played any of our roles on that show except for Leonard Nimoy playing Spock." I think that's stunningly true. Koenig takes self-depreciation to a mania but this is insight.
Well, Spock being half Vulcan was going to prevent him from delivering a bigger, dramatic reaction to his "pain memory", while Kirk flat out refused to have his personal life held up by a manipulator's puppet strings, so Shatner's performance was--by necessity--subdued compared to the others, with the exception of his growling "I need my pain" moment.
Now I'm trying to think of what my favorite McCoy moment is. Surely this is one, but that's the easy answer. His monologue to Spock in TSFS is also great.
Nimoy had kind of lost what Spock was about, I think. It was kind of an outgrowth of The Voyage Home. It was more Data than Spock. I'm not saying Data had anything to do with his performance but it became more robotic than logical. It had an "innocence" (or ignorance?) about it. Which was never Spock.
I can't say with any authority, but there are parts of Shat's performance in TFF, particularly the comedic bits with Nimoy and Kelley, that feel very improvised. Maybe someone can point me to an example of Shatner doing improv that is great, but these moments are not great. But when he's being serious, and dare I say "on script" he's as good in TFF as anywhere else.
TOS Font on a TNG+ Era show will never NOT look weird to me. Just not what I associate with the 24th or 25th Century.
Are you talking about title fonts or in world fonts? Examples? Deep Space Nine?
Funny that the TNG font went the same way as the Enterprise D bridge: Never heard from again.
I have a promo pin from 1987 of Star Trek: The Next Generation in the TOS font. It was pretty cool, actually.