Bleach was good when it started, then the massive pacing issues started, then the shitty writing really took ful lforce, then Bleach lost great fighting scenes leaving any reason to watch the show worthless.
I read through the Soul Society arc and the reveal of Aizen, and maintain that up to that point it was quite good. The conspiracy and in-fighting were well done, fights still had some manner of tension with Ichigo just kinda-sorta at the level of other elites, and the initial supporting cast was both relevant and useful in their own right.
Soul Society felt like a team effort on all sides. The exponential growth rate hadn't really kicked in yet, as defeating the Hollows was kinda expected of competent shinigami, while the various groups and sub-groups within the Soul Society made it feel like they were roughly compatible with eachother power-wise. Some were stronger, some were weaker, but none of them felt untouchable or unstoppable- if a Captain stood against another Captain, it was serious news and a power check, rather than a question of 'who is it? Psh, no chance.' I don't even remember their names, but when the old super-dude is confronted by his two students over moral differences of the rightness of the course of action, I understood that two-against-one implied the power at stake but I also didn't feel it was some hopeless contest against a virtually insurmountable power level.
Aizen's success was impressive not just because of the deceit, which was credible, but because his manipulations put the Soul Society into gridlock rather than unified against him. His finger-block of Ichigo, rather than being a harbinger of the virtually omnipotent/omniscient figure, was instead a reminder that Ichigo, despite his growth, still had a long ways to go before he was truly powerful, and shaded the recent loss of Rukia's brother as both a taxing event and a circumstantial victory that might not have occurred in other contexts (like the guilt trip).
Aizen was powerful, but not omnipotent- he needed Soul Society divided against itself to move forward with his ambitions. He was clever, but not completely successful- unpredicted factors interfered and threatened him. Ichigo was strong, but not overshadowing his peers to the point that they were token assists. The Captains were important wildcards, rather than cast stuffing..
It's a shame they didn't keep that.