Why do people like Goodfellas so much?

I mean no disrespect to Martin Scorcese or anyone that does like it, I just wasn't a fan. It's amassed a fairly large cult following, has received very positive reviews, and multiple awards sure enough, but I just didn't like it that much. For starters, to me it lacked a central plotline; it was just mobsters doing what mobsters do and it followed the true story pretty much to a t leaving little room for creative improvisation. I don't really care much for realism in movies; I just enjoy escaping from reality to see something that the world isn't. I know it was based off of a true story, but even Casino (another Scorcese film) was based off a true story and it managed to improvise a bit, as such I enjoyed it a lot more. Secondly, Lorraine Bracco; I'd be lying if I said I enjoyed her performance very much, though the rest of the acting wasn't bad. To me she lacks emotion in her acting; that aside her character was very uninteresting to me; she just whines about how much she hated her husband even though he refused to leave him, and even ended up enabling his drug habits. This was another category where I belive Casino was superior; aside from the fact that Sharon Stone (the correlating wife figure) is an incredible actress in general, her character was actually interesting; she made me hate her, and if an actress can make you hate her character she's done her job in my opinion; Lorraine Bracco's character was just annoying. Anyway, that's just my opinion; feel free to leave yours.