In 2015, I started keeping a list of movie ratings to all the movies I would see. I used to write a short blurb on why I rated it the way I did, but it eventually distilled to just a letter grade. Time also changes the way I would rate something as some things get better (or worse) if I rewatch them years later, but these ratings are mostly based on the first time I watched them. I used to watch TONS of movies before 2015, but sadly I don't have ratings for most of those.
I would recommend watching anything B- and above. (Sorry the rating filter isn't perfect as the sort will show B's above B+ and B+/A-)
Let me know some of your favorites or where you disagree!