Talk about an arc that gets a lot of flack. I would say that it's the FKT arc that gets it, although, I can't blame those that feel indifferent about the arc. Personally, I liked that arc along with the Hueco Mundo arc. There were a lot of things I could do away with but it kept me entertained in the end.
My beef with Kubo is that he cannot transition or close out well. We saw that at the end of the FKT and the beginning of the fullbring arc. He ended an arc with a lot of questions roaming about and goes straight into another arc and, for me that left a bitter taste in my mouth. And begin an arc the way Kubo started the fullbring arc, I definately would've preferred he took the time to do some follow-ups and answer a few things that're plaguing many brains.
Despite the slow start of the fullbring arc, I didn't consider it bad at all though. It definately had a rushed ending which again, he transitions to this new arc without anything. The only difference with this latest arc and the last is that it's going in right at the start with some horrible new characters, and horrible returning characters which is teetering on the edge of losing me altogether even though I'm still anxious to see bankai. And then the thought of going back to Hueco Mundo to rescue more characters...
GGXXAC+R - Johnny, Sol Badguy, Order-Sol
BBCP - Hakumen, Hazama, Jin
3S - Dudley, Makoto, Ken, Ryu, Yun, Yang
USF4 - Dudley, Makoto