I
HATE how everyone's strength continually changes.
Ichigo fought Kenpachi to a standstill with only his shikai, then Kenpachi comes back later and beats up Nnoitra after Nnoitra effortlessly beats up masked bankai'ed Ichigo!
And that's another thing that bothers me... Ichigo's Bankai... It was pretty cool at first, then all of a sudden with the Arancar it was like it stopped working! Ichigo's Bankai made him UNGODLY fast, yet all of a sudden he needs to use his bankai just to keep up with the Arrancar.
And why aren't the Vizard there yet?!
Edit:
Afterthought:
I hate how everyone can FLY now. In the SS arc they made a big deal about how useful special flying equipment was, and Ichigo got a badass flying cape, then it turned out Ichigo could fly in Bankai... and now EVERYONE can fly.