The documentary is fine. The Star Trek aspects of it are pretty boring if you're a fan at all - I understand why they include that, but there's only so many times you need people saying that Star Trek was groundbreaking and yadda yadda yadda.
It's also part George Takei biography, which most people who know Star Trek would know about but isn't as well tread territory so having him talk about his life is nice. There's also a short tribute to James Shigeta as well which is nice. I've always recognized him as a character actor from the time but never really thought about his career. It doesn't really go into his history, if he has one, but it's a neat interlude.
The most interesting part is the making of the documentary itself and I'm surprised they filmed so much b-roll and random stuff outside of the production to have all this footage of them working on the film - at least when Takei and Shigeta are around. There's some tension with the original director that they don't really touch on - Stan, the producer, lost the footage and basically moved on from the project after he father stopped funding the project in order to get him to focus on school again and that seemed to have caused a decades long rift that they don't really touch on. But I think seeing them try to make the film originally, then also seeing Atkins, someone from like 20 years later, "rescue" the film and finish it is neat.
This is what I was mostly expecting, similar to that documentary about doing the shot for shot remake of Indiana Jones that the kids-turned-adults finished a few decades later. I wish it was more of the documentary anyway.
And at least there's some admission that the fan film isn't that great. lol
I'd say if you're interested in the history of the fan film, it's worth checking out. The standard "Star Trek is awesome" stuff does take up a lot of time and it's nice to see fans talk about how Star Trek is meaningful to them and all that and it helps if you're showing the film to someone who knows nothing about Star Trek whatsoever... but then I'd wonder why they'd be interested in this documentary at all.
I also did just check out the fan film and yeah, it is what it is. Credit to Atkins for trying to make anything work with only the original footage, and the fact that he himself took 12 years to finish the thing is definitely a sign that this is really a labour of love for everyone involved.