Mitsukazu Mihara is great at spinning dark, emotional stories. This manga is no different in that respect. She always spins a good tale.
However, the very subject matter of this manga is its very downfall. Not because it deals with death or embalming or the treatment of corpses (as others have said, the point is continually made that embalming (and thus, these stories) are more about the living), but because there's no element of surprise. Every story starts out in a different way, but you know they're all going to end in the same way - someone's going to die and be embalmed.
Maybe that says something about life itself. I have high enough esteem for Mihara's work that I'm pretty sure it's meant to. Our stories may all be different, but they're all going to end the same way. It's a deep and profound thing to express in a manga... but it doesn't necessarily make for the most riveting of reading material.
Also, American readers might find the subject matter a little awkward at times. Again, not because of the corpses and constant death - but because in America, embalming isn't a particularly taboo or interesting job choice. The almost fangirlish reverence for the embalming profession is almost... awkward. Sort of like fangirling about plumbers or accountants.
However, this cultural difference is kind of fascinating in itself. In that vein, the "Japanese foreign student in an American school" chapters were really interesting. It's interesting to see a Japanese person's perception of the experience. I found it fascinating that Mihara mentioned how fast English is spoken. I've always thought Japanese was spoken ridiculously fast by native speakers, so it's eye-opening to find out they feel the same way about our language!
All in all, I would say that this is almost a concept manga. If you can suspend the need for plot twists and turns and just take it as an artistic statement, it's really quite beautiful.
Also, I feel that the 4 scanlated/licensed volumes do a decent enough job of conveying the story. It would be great to see the next two volumes, but the 4 we have available don't leave you with a cliffhanger that will have you denouncing Tokyopop for dropping the license or offering scanlators your first born just to get the next volume uploaded 😉
TL;DR: For conveying a deep/sensitive issue beautifully and artistically, this manga is superb. For fun reading material, it's a little below par. Also, don't let the incomplete scanning/licensing hold you back. The 4 available volumes do a decent job of telling a complete story.