Of course they are a problem? The real issue is the star ratings in aggregate of course, but the value in individual reviews is detecting patterns - "didn't like the lock thing" "latch was loose" "maybe it's just me, but the latch didn't feel solid" "the lock broke off within a week". You start to see trouble spots if you know how to skim actual reviews.

So to get that value, you don't restrict input, you leave it open, the "pretty box" people aren't ideal, but it's fine because it allows for the breadcrumbs that tell the larger truth. It's ridiculous to expect normal, busy people to do "consumer reports" style reviews for every small kitchen sponge and packet of stickers sold online?