To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Maybe I'm just unlucky but with my HP MFP M277n I've twice bought the genuine 201A cartridges and found that the black one has become unusable (unreadably faint prints) after only about 500 pages of normal use. This is despite all the usual tricks like taking the cartridge out and shaking to redistribute the toner. According to the Supplies Status report, the black cartridge is 50% full - and yet it's already unusable. I've had to start printing documents in dark blue just to make them legible. Worse still, the MFP driver allows no control over print density. HP support are utterly useless - just the same endlessly repeated but unhelpful copy/pasted answers. I've used a wide range of HP printers over the past 25 years but frankly, after this experience, there's no way I'd ever buy another one.