Uzumaki is truly a one of a kind work, completely [BAD WORD] beautiful. Ito Junji's way of making an odd concept the center of a horror series is so captivating. I'm gonna break it into a few categories:

ART: Ito Junji has the (not arguable) BEST artwork in horror manga. He manages to use the layout of the page to the fullest keeping the horror moving throughout the pages. Uzumaki is about spirals (thats the easiest way to put it) and a town being affected by it. It is hard to talk about art without spoiling the experience but holy lolis it is gruesome and gut wrenching throughout. 10/10

HORROR: Spirals aren't inherently scary so a horror manga about them may seem quiet odd. It is, and very worth your read. Ito Junji is best known for short stories, and that carries into Uzumaki heavily. Every chapter has a mostly contained main spook, but it works since each chapter is given enough attention for this to be managable. 9/10

STORY: Honestly one of the low points of the series, YET is still very good. Watching the town slowly get more corrupted will most definitely keep you interested until its all over. You're not gonna get spoilers from me, go read this one. 9/10

VERDICT: Just go read it, its a masterpiece. 10/10