A lot of people are saying that this is just rip-off of Fairy Tail.. but wait, is it really true? Nope.

STORY 8/10

This Manga have uniqe story, with totaly different setting.
I wont spoil you because it will just make your experience with this manga worse but for comparison - while Fairy Tail was fantasy/adventure styled, this is more sci-fi/mystery/adventure styled..this manga will make you ask questions, think about depth and enjoy fights from the very first chapter.
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ART 9/10

Art is really great, you can instantly see whats going on even in panels that have many things drawn in, facial expressions are one of the best I ever seen and pages are greatly detailed.
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CHARACTERS 7.7/10

Characters are great, each one is really interesting and both main characters somehow destroys stereotypical Female/Male duo that is in the 90% of shounen manga.
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[Next information might contain mini spoilers but will not or only slightly effect your enjoyment of manga]

Main male character is totaly innocent while main female character is badass on the inside and have some really uniqe traits that female characters have really rarely + some of them are that unique that I never seen them before . Both characters are strong in fighting and have good chemistry between them.
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ENJOYMENT(?) 9/10

[In short] - Chemistry between characters, great comedy and nicely incorporated fanservice with nice story depth and mystery from the very first chapter. - This things makes Edens Zero very enjoyable series in which I couldnt find one forced or rushed scene.

[Comparison, you can skip this part if you havent read Fairy Tail]
- Now to the point about Mashimas old manga - FT... this is total opposit of what Fairy Tail was. You dont need to read more then 1 chapter to get this.
And similarities? Oh yea, character designs are really similar and for the first sight they look really similar, some almost same as fairytail characters..
But is this really a reason to hate or somehow lower rating of this manga? No, its not.
Why? Because even if you got totaly same character designs its still a different story with different personalities and different setting. This manga is actually more interesting even in its first 2 chapters then Fairy Tail was most of the time. (atleast for me)

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OVERALL 8/10

There isnt much to rate from 130 pages but I can sense big quality and potential in this. That is what makes Edens Zero worth 8 points of 10... in future I might give it even 10 or if potential is wasted only 6 or 5. But Iam writing about quality that Edens Zero have currently and thats what is most important.

/Sorry for grammatical mistakes/

Edit: After chapter 6, manga is even better, Iam progressively questioning more questions and it becomes more interesting by every chapter. I might rise the score of story or even overall if this goes on.