ARRRRRGGGGHHH! POSSIBLE SPOILERS MATEY! BEWAREE!
Straight up, I've played Fate: Grand Order for years on NA (Global) so I know what will happen, who they are, more than the movie will show and it'll be something else to not show bias. But here goes, for when have I not been corrupt?
Story: This hour is the first few hours of the game, an introduction/tutorial. Sets up the dominos and the foundation while tackling a mini-singularity, hence the short runtime. It's a good beginning, sets up Chaldea and the hub world, the General stuff. Middle and such, it's the singularity. It's not the most engrossing but it's still good in its own right. Fair to good, as we get a rudimentary explanation. But it works well. It keeps moving, has some great fights and by this point, it should be apparent in how it ends.
"This is just the beginning", and it is. But it doesn't leave without dropping some nice twisty bits and charm with the beginning chemistry of Ritsuka and Mash.
Animation: Definite yes. It looked hella gorgeous, fight scenes in particular. CGI in Medusa (?) fight was well blended and looked great, and the final fight scenes, that was grandiose and a spectacle in giant beams and shit. It was clean, not jagged and just general competence.
The character designs are even better. Mash and Fou are adorable, Director is a cutie pie and looks great, Medusa (Name without fact checking) is a hot piece of ass. That is quality design. Alter must mean hawt with a capital HAWT. Long legs, Alter tats, busty and thicc all around. It'll take too long going one by one but let's just say that it's fantastic. And don't worry, there's enough for the ladies too.
Sound: For once, in a while, I have no specific preference. The dub felt competent, better than usual. There was enough emotion and distinction in their voice. Elation, excitement, snoring, sadness. Same is probably said for original Japanese. Watched it dubbed as I was lazy.
I have nothing to say about the music. It was good, suited the mood.
Characters: First off, Gudako. That cameo was everything. Best Easter egg for those that played the game. If you didn't, disregard this. Otherwise, you get names, not much background, character traits, possible quirks but that's looking super deeps and probs into the future- for an hour, it's pretty good. Some bias here but the classes represented and their respective... representatives, are to my liking.
Overall: This can be closer to a 6-7 but I really enjoyed it. Quick, nice fights, memorable characters and designs and while it isn't deep and it can't go into the nitty gritty of the world, it's a solid start and entry to the series. A trip down memory lane and as such, resonates with me more than someone going into the Fate/Grand Order franchise for the first time.