Well the answer is hidden in ur title only .... while Kishi obviously bit off more than he could chew in the recent arcs, most people bash the entire series, the main theme, mangaka for reasons such as 'the manga is too unrealistic' (duh), 'no ebil valiins' (Go watch DBZ pls .... where people are evil for no apparent reason), 'obito OP shld naut get defeated' (Well this is a common occurrence ...), 'power of friendship' (Did u miss the Sage Enhanced Yang Kurama powered Susanoo blade? .... that also managed to barely cut Obito) .... that actually annoys people who actually has a bit of comprehending power till they start generalizing ... while actual reasons are welcome if presented correctly.
Also 'Dont like it dont read' is valid argument ..... After dedicatedly following Bleach I found my self bored by certain arcs and so I took a break ... and returned now that its great again. I never blamed the mangaka and his capabilities repeatedly in a public forums ...