How accurate is an Amazon star rating for picking a desk clock?

It's a useful starting signal but not a verdict. Amazon averages are gameable and these listings carry no corroborating expert-lab or specialist-community data, so we treat high review counts (like the 29,000+ on the top DreamSky pick) as a stronger indicator of consistency than a 4.7 average on a smaller sample. Cross-check return reasons and recent reviews before buying.