Make no mistake about it: Bilal has a wonderful style as a graphic artist. I love to look at his art. Unfortunately, he did not stop there and tried to write a genuine sci-fi story.
I got this series when it first came out in France and was learning French, so had looked at the pictures and was intrigued to get into the story. Alas, dictionary in hand, I went through slowly and carefully and found it, well, stupidly unbelievable, with stilted dialogue, little hard sci-fi that reflected some current trend in reality (what can make sci-fi great literature), and silly characters with no resonance whatsoever.
So, if you just want to look at the images, I wd give this five stars - easily. Bilal's sense of scene and the atmosphere of decadence, the acuity of his characters' poses, and a mysteriousness that runs thru his work are wonderful. However, the writing is so bad as to be laughable, which a recent re-reading reinforced for me. Moreover, the Egyptian Gods are props and equally boring, without any dimension that makes them interesting in any quirky way.
Not recommended as a sci-fi experience, tho it is fun to flip thru as a visual extravaganza. Bilal should be an illustrator for a good writer.