Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
The product is too small. I don’t recall the size being included in the description. I’ve had these plastic coffee funnels since forever and they’ve always been one size. The hole at the bottom is bigger than most and the spines inside are more raised this seems to allow the fluid to filter faster. Not sure, if this is a good thing.