Take note that I am an avid FGO player and have played through every chapter in the global server of the game.
Story: 5
Okay so first off, let me tell you that FGO is a very long story. Camelot alone has 6-10 hours of read time inside the game depending on your individual reading speed. As this is a movie, 2 movies each with 1.5-2 hours of runtime, it will never be able to show every aspect of the story. The fact that this is one of the later story chapters also caused some issues. Anime only peeps will have a ton of exposition just smacked into their faces that they might not understand properly. The overall pacing was just a mess since content was cut out here and there, like the initial meeting of Nitocris with Chaldea before they go to the Holy City and fight Gawain and when Ozymadias' head slided off a bit for spoiler-ish reasons.
This next one might purely be biased because I like Gawain but the movie did not portray him well. He was seen as this knight without match if he was under the sun. In the game, Bedi was barely able to match him by himself which allowed Mash and Da Vinci to break the circling formation of the guards to make an escape route in which the survivors retreated. Bedi clearly showed signs of pain stemming from the use of his arm. In the movie, Gawain was apparently knocked out by Bedi and then they make their escape.
They also removed two charancters, Hassan of the hundred personas and Tawara Touta, but this was understandable because the role they took are far less important the the ones who remained. I was still pretty sad tho because I liked Hundred Personas.
Art and Sound: 6
It was nothing of note about the art and sounds except the cg crowds used. I was constantly noticing it because of how out of place they look but the cg knights was actually better than what I imagined it to be.
Character: 8
This is one of the best story writing the game has to offer since Nasu, the writer of the original Fate/Stay Night, is the one who wrote it. This is the best part of the movie and what made me fall in love with the game. Some parts didn't make it to the movie very well though so I put an 8 in the character.
Enjoyment: 10
Okay, I'll be real here. I enjoyed the movie the most because of the portrayal of Arash's sacrifice in the last scene of the movie. It was shown as a last sacrifice where a hero stopped this all powerful goddess' verdict to destroy them in the game version of this scene. In the movie, it was shown as a sacrifice to save everyone in the village. I think the movie making it so that Arash shows up in front of everyone who is now falling to despair made is just as great as the game. Seeing one of my favorite stories in game which I have stuck with for a long period of time animated has also upped my enjoyability.
Overall: 7
This movie is really catered around fans of the game in my opinion. FGO players will easily find this more enjoyable than others. As I am one of them, my score might be higher than a standard person's score. If you want a better experience, play through the game yourself or you can read the story online on youtube. I can guarantee you that the game version of Camelot will be worth your time.
