This post will contain spoilers, especially for Bleach.
Read Dragon Ball/Z, Rurouni kenshin, Yu-Gi-Oh!, Bakuman, kekkaishi, Flame of Recca, rave Master, Samurai Deeper Kyo, Fullmetal Alchemist and so many more. if it's shounen and published in english then I probably own it.
I follow many series being published right now like nisekoi, Toriko, Magi, Food Wars, Seraph of the End, Seven Deadly Sins and so on.
The only Manga I read consistently on a week to week basis because I've been doing it for the last 10 years is One Piece, Naruto, Bleach and Fairy Tail.
One Piece is for me is one of the best series ever and if Oda pulls of all these mysterious he's set up it may very well be a masterpiece but that's far in teh future.
Naruto I enjoyed until the end of the Pain arc where everything then became talk no Jutsu and the world war was just awful.
Fairy Tail is just dumb fun.
Bleach for those first 27 volumes was great, then we entered Hueco Mundo and everything just got awful. But I keep reading because I didn't spend 10 years on it to not finish it.
the rumors say that Kubo was forced to start the soul society arc early because readers didn't like the substitute shinigami stuff so Tatsuki, Keigo and the other guy never got the development and spirit power they were originally planned to have so they could join Ichigo's team, dunno if true but considering Tatsuki could sense spirits at the beginning I think it is true.
Second problem the popularity polls came in during the Arrancar arc (Volumes 21 - 27) and the shinigami pretty much ruled the roost in them and so the human cast who we had been following for 27 volumes was all but abandoned except for Ichigo in favour of the shinigami and the series just became an absolute bore to read because the shinigami are too powerful, none of the Espada or thur minions could touch them and then after 100 odd chapters of all these meaningless minions that had almost no prior screen time or character development getting destroyed Aizen went ahead and solo'd everyone, wtf. Then finally after years of waiting Ichigo vs. Aizen starts and pretty much ends in a OHKO.......are you kidding me.
We had seen the shinigami as villains for Volumes 6-20, I had no connection to them, I wanted to continue reading Ichigo, Uryuu, Chad, Orihime and so on as they went against all odds against the big villain. that's what works, your little band of heroes go against the opposing evil force against all the odds and that's where you get you an emotional connection as you try and think of how they could win or what will happen if they mess up. but Kubo reversed that situation. It was the villains who didn't have a chance against the good guys and it was so boring and repetitive. Chapter 1 of the fight would make it look like an even fight and end with the villain transformation, chapter 2 would have the villain beat up the good guy who would reveal something about his sword at the end. Chapter 3 would have the shinigami completely destroy the villain with ease making you wonder why we had to spend 3 or more chapters on this when he could have just done that in the first place. I mean I don't know these bad guys, I don't wanna spend a month reading their fight, they just showed up to make sure everyone got a fight and had no chance of ever winning or making me believe they could win.
The Espada weren't much better, Starrk lost to a Shikai, no ban kai needed to beat the number 1 espada.
Kubo wrote hismelf into a corner with Barragan so had to use his own power to kill him and he repeated this stupidity with Gremmy in the blood war arc.
Harribel was cut down by Aizen cause she was useless to him just like every single minion he had, even Kubo knew the whole thing had been pointless but only skipped Harribel's fight instead of all the dumb minions that no one cared about
In terms of tropes the shinigami are the "Big Good" the one you call on when all hope is lost, example would be the Hokage having to save Naruto in every fight or Gildarts in Fairy Tail. Woudl One Piece be as interesting of Shanks crew bailed Luffy's crew out every arc, no and that's what the Shinigami did for Ichigo and his original team.
and the current Blood War arc is just the same, for a very small moment the Quincy looked to have the advantage but as soon as Kisuke got the bankai's back the Quincy were fodder for the Shinigami. Just one squad Zero member wiped out all 4 of the supposed Elite Guard of the major antagonist. and just like Aizen, Ywach is so powerful now he probably doesn't need any lackies to begin with, he could have just solo'd everyone and saved us all this time. It's not like anything was stopping him, like When Frieza is away searching for the password for the Dragon Balls while the Ginyu Force fight Goku and co. Two quincy beat Hitsugaya and Soifon to an "inch" of their lives but ban kai's came back and they one shotted the completely unharmed Quincy despite being vitally injured....how does that make sense.
Ultimately the decision to favour the shinigami probably saved the series in japan but for me it killed it and made it one of the most boring manga. you just look back through the manga and tell me the last fight you read where you believed there was an equal chance that both fighters in a match could win, cause for me it Was Ichigo vs. Grimmjow in Hueco Mundo, everything has been a one sided slaughter ever since either for the shinigami or usually the main villain.