As an overall "should i watch it" popular Hollybuff rating i think it's pretty decent, but i don't think it's a good way to find a "good" movie
IMDb is highly biased in newer movies, but i agree in older ones it goes OK
RT is very swinging, their system refers mostly to a yes or no due to anything being 90+ or -50
Moneymaking prowness is a bizarre stat, plenty of not very good flicks have made absurd amounts of money, while a bunch of good ones have been box office bombs or received no mainstream aperture
Then you have old boy Ebert, the mood swinging man, his rating system depended on his breakfast quality and ended up with a similar RT answer, it's not about good or bad, it's about wasting your 10 bucks ticket or not
And all of this might present a controversial decision, not in a thousand years will El Mariachi be better than The Godfather, in 10 bucks or quality perspectives, same with Fistful of Dollars slapping Das Boot
For a local rating, or a filmeater one, my idea would be a good plot synopsis, due to our opinion varying highly on our personal tastes regarding plot, and a small 7 star rating, with 4 being average, 1-3 varying degrees of not good and 5-7 varying degrees of good. A movie might be a 2 but its story, actors and director/writer might persuade us to check it if we are fanatics of 2 or 3 of these factors. Same with a 6, the story might turn us off along with its director, no execution might save it from a personal distaste in some cases
Just an opinion thou