As a movie fan/data nerd, I visit the website Rotten Tomatoes a lot. It’s a movie review aggregator site, which tells you what percentage of reviewers consider a movie a hit or a miss. Movies where more than 60% of reviewers consider it worth watching are classed as “Fresh”, while any movie with less than 60% good reviews is considered “Rotten”.
It’s not the most nuanced of review sites, but it gives you a good overview of critical opinion.