Review-bombing has become a serious problem on the review aggregate website Metacritic. Over the past few years, we've seen user scores for a number of high profile Nintendo Switch games plummet on release.
This happened to Pokémon: Let's Go, Pikachu! and Let's Go, Eevee! in 2018, Astral Chain in 2019 and most recently Animal Crossing: New Horizons earlier this year. A lot of the time, these zero out of 10 user scores are dished out by people who haven't even played the games yet.