I hate ignorant product reviewers!
It seems the average customer review rating for nearly any given product on nearly any given online merchant's site is likely to be skewed by the opinion of people who used the product for something it was not designed to do.
One small example: low-recoil ammunition for virtually all firearm cartridges and shotgun gauges get plagued with negative reviews from people complaining that the stuff wouldn't work the slides in their automatics. Anyone who was expecting any kind of low-recoil ammo to function properly in an automatic is obviously an ignoramus.
This kind of stuff pisses me off. It makes me feel that the stated average customer review is misleading, and that I must take the time to actually read each individual review in order to learn anything. Stupid people ruin the world.