I'm an outlier, I enjoyed the entire Bleach run, filler included. I thought the Bount arc was a legitimately cool and logical breather period and an homage to horror tropes (the endless maze, the creepy museum, the spoopy hospital with the haunted faucets) and then the introduction of the main villains in the arc ended up being this vampire/voodoo inspired rogues gallery of villains with no connection to the Canon- which means for once you don't know where the story is going, other than that it won't contradict manga canon and most of the filler characters will die/never appear again.
People say it's slow, but it's pretty distinctly split into three acts: the first third (admittedly useless) with the Mod Souls, the second third with the Bounts in Karakura Town, and the third...third where they go to the Soul Society and have an big showdown. It's pointless, yeah. It's filler. But it's essentially a reworked version of the arc directly prior to it, just replacing the Gotei 13 with a new anime exclusive group of opponents for Ichigo and Co. I never get (unless the character writing is shit) when people refute filler for the reason that it isn't canon. If the characters are written true to their canon versions, I don't see why anyone wouldn't enjoy more time with characters and settings they love.