I put 5 stars out of 10 just because I am a fan since young so for being a fan of the series, I gave an honourable 5 but it can be worse.
First of all, I don't like the title. I know it is a spin off but it is just wrong to put a character's name on it when the main character is not that character.
Secondly, it really bothers me before that Brass Saints just beat up everyone and continue to be lower level Saints. They ends up to be the strongest Saints and defeated many godly opponents. I actually liked Hades saga because the Gold Saints were involving in a lot of fighting and showed their great powers. This new instalment just does not make any sense that Brass Saints just keep defeating Godlike characters for no obvious explanation or storyline. They just suddenly become so strong and overpowering anyone on their way. Gold Saints become secondary and we already know they cannot reach Omega level by now.
Thirdly, I actually find that the story is interesting in a certain way and the drawing technical is improved but it is about the links between the chapters. Nothing particularly makes sense between the chapters. Other fighting Manga like Narutos, Dragon Ball or One Piece shows improvement of the characters, they learn through their adventure and gradually become stronger as the story develops, which makes more sense and enjoyable to read/watch. Saint Seya Omega story is nice but lack of sense that other mega provides.