Since the comaprison with DEENfate came up, I think this one is actually better just because its pacing is a lot better than DEENfate, even with the lull towards the end.
I think as far as direction and flow go it's actually pretty good because I'm never actually bored while watching Apo, it's just that there's nothing really beyond the flash.
The best comparison is probably with Zero, again, the gold standard of Fate spinoffs. Zero uses a thematic component from HF and spins its own central conflict out of that, Apo tries to imitate the beats of the Fate route without the same substance. Ironically while Zero is more directly related to the source, Apo is the one that relies on you remembering stuff from FSN and go I RECOGNIZE THIS. Sieg and Jeanne tries to be Saber and Shirou but while the latter two had actual chemistry and an ideological connection the only reason Jeanne likes Sieg is...protector instinct and teenage hormones? Sieg doesn't even seem to be interested in Jeanne until the very end I guess.
Who even is the central character of this? I just default to Sieg because he has an arc and a lot of screentime. Maybe it's Mordred and Shishigo? But they get the midboss realization of not actually wanting the grail to no greater thematic point than "the magical wish granting device will not fix a problem thats in your head". Thanks afternoon cartoon.
If Sieg really is it what's the fucking point? He has become more human? Is that it, he's a real boy now? If you're not a real human but act like a human there's no difference between you and a human, is that what this is trying to do? Is this an Asimov story with an equal measure of added ineptitude and anime tits? I don't get it.