Honestly you might find it more accurate to go by gut feeling/trailer or word of mouth. Imdb ratings are good for weeding out the truly bad ones, but for the rest it’s fairly unreliable. You can also see rotten tomatoes, but these days it feels very astroturfed and I haven’t really matched my rating with theirs for all but a couple movies that I saw. Letterboxd is better for user reviews but it’s very hivemind-y because popular opinion prevails kn their ratings.