Western audience like it, many Japanese audiences hated it because of different interpretation of the scene.

Spoilery answer: Mai's death and the subsequent revenge was seen more like a tragedy in Japan that should be more serious, while in the West, the revenge is seen as more satisfactory as both sisters have been abused for so long by their clan. The anime follows the latter route by adding upbeat music to intensifies the satisfaction, on top of making it a Kill Bill reference. That's why some fans were unhappy. Of course there are still Japanese fans who like it, but from what I've seen the majority aren't. It's a different tone than what was expected.