User blog comment:Soulreaper1234/Why Do Ichigo & Aizen an Overpowered Hero & Villains?/@comment-1268838-20100828182558

As I said a few times before, this is just a classic example of Kubo following the standard Shounen formula. The most popular manga series in Japan always seem to be the ones featuring young characters that possess an astonishing growth rate, overpowering enemies with far more experience than them by compensating with their immense resolve or inherent abilities. So naturally, the main character ends up being ridiculously powerful. The villains tend to follow the same formula.

I think the problem here is that while this is a natural trait of Japanese comics, we consider it a cliche. Comparably, American comic culture for example mostly featured older characters that attained more power through different methods, particularly the popular superheroes. On whatever basis, any type of literary experience we have is what we use to determine that Kubo's story writing is getting a tad strange.

Personally, I just go with the flow. I can't blame him for following the same pattern as many mangaka before him.