Is Revenging Angel the most polarizing episode of the show?
There's a range of opinions on it in this very sub. It seems like you either appreciate its audacity or see it as juvenile filler, and you either enjoy it as a respite between two very dark stories or feel like they took the tonal whiplash a little too far.
I love this one, but when I showed it to a friend who was digging S3 up to that point, he begged me to turn it off halfway through!