One-star reviews, in addition to being the least helpful kind of review, are also the longest and the worst-spelled. Data journalism blog Priceonomics analysed 100,000 online product reviews and found that 40 per cent of one-star reviews have at least one spelling mistake, vs. under 30 per cent of five-star reviews.
Five-star reviews, though, are most likely to leave out periods at the ends of sentences - likely because they're shorter - and four-star reviews are the most likely to leave out apostrophes. Weirdly, after adjusting for length, three-star reviews have the most frequent errors.
Spelling and grammar aside, we still believe in productivity godfather Merlin Mann's rule of starred review quality:
(ordered by typical usefulness)
— Merlin Mann (@hotdogsladies) June 3, 2009