While I think this filler arc actually seems pretty promising, especially as far as Bleach fillers in general go, the same thing still bothered me as well. I still remember how it was pretty thrilling indeed in the early Bleach episodes when the Gillian suddenly appeared in the real world and everybody was ready to shit their pants, and they were barely able to send the lone Gillian back where it came from, but not destroy it.

I never like it how fillers usually disregard all canon power levels, for both protagonists and antagonists, and treat everything as simple hack'n'slash cannon fodder. It happens nearly every time.