You like Goodfellas, but hate Mean Streets
You probably have no significant social life, possibly a male under 18yrs old, maybe female, you play video games, adore CGI, and you don't understand Italian American subtleties, and New York culture.
Goodfellas is a comedy, shoot-em-up hollywood type flick, and you can't handle a more realistic mature movie like Mean Streets.
Movies don't have to follow a strict who-dun-it plot, or comprehensive climatic endings.. real life isn't climactic, real life is dramatic, just like this film. it's as close to real life as I've seen out of any Scorsese movie.