I personally use a 4 star system. Growing up we only ever had one cable provider, and every movie on the cable guide had a 4-star rating system. 4 stars being the best possible rating and 1 being the worst. Half stars can also be attained. Any films under 3 stars are not "great" and should be considered rentals at best.

Example: Godfather is 4 stars, Fellowship is 3.5, Signs is a 3, etc...

most recent movie I watched was House of Gucci. I give it a 2.5 out of 4. the acting carried it, I also enjoyed the costume design, but editing and direction was bad, catch it on streaming but dont buy, and its not worth a rewatch. But I also recently saw Banshees of Inisherin and Nope. I give Banshees a 3.5 and Nope a solid 3.

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Can't remember the last time I watched a true 4. Maybe Parasite.