(Light spoilers onwards)
Just tell me why, Tite Kubo. What a way to mess up with all.
Many Bleach fans have already seen the anime and the arcs animated as well. I think we all loved the Soul Society arc and the next ones were very good too. The biggest problem of Bleach were the insane powerups but the general quality was good...until we reach the Quincy Arc, the last arc and this manga's biggest mistake. I will talk about entirely about this arc in this review, while the rest of the manga has been valued to the overall score too.
The Quincy Arc started pretty good, with a good premise, badass villain and many things, Yamamoto's bankai, etc...but since then, it turned out to be so bad. Even if the chapters at the Zero Squad were pretty good and i enjoyed the fight between Ywach and Ichibei, the last 70~ chapters have been absolutely horrible: pointless powerups, many characters don't have a proper ending and many things remain completely unfinished, those Quincies absolutely unkilliables, powers not explained, and many many more mistakes.
Let's talk about the ""final fight"". Ichigo had many types of power, new sword, new bankai, new hollow development, control of quincy blood...and we didn't see a shit. Ywach just destroyed him again, and again...Tite Kubo just overpowered Ywach so much, to an insane point. Ichigo's new bankai just breaks again and again vs Ywach. Why even bother to design ichigo's new appearance and bankai to fuck both of them in just two chapters or so. The way they defeated this guy was a complete asspull, and the ending has no sense at all. What a way to destroy a manga, a show, that i enjoyed so much for many years. As i said,may things incomplete and unexplained...Zero squad? Vizard? Fullbringers? Grimmjow and Arrancar? Why Aizen is still in the fucking chair? The couples at the end have sense but that's not the big deal here. I don't know...this arc just destroyed Bleach.

Talking about art, it improved along the series,but it's so clear that Kubo doesn't have any helper. The backgrounds are so plain, boxes are so big and there are very few dialogue, what slows down the manga. Look One Piece in comparison and you'll know what i'm talking about.
Overall, the last arc illed my Bleach enjoyment. Was pretty awful and painful to see, specially if i was a bleach fan for 10 years. Thank you, Tite Kubo.