I think people like Scorsese films because: they are good, and he is a good director too (not saying he isn't) and because they really dig the subject matter (gangster/mafia/crime hard edge films are popular). So what I'm saying is: Reiner doesn't get really acclaimed like Scorsese in large part due to the subject matter of Reiner's movies, even though Reiner has proved himself to be a competent director.
__________________
Letterboxd
Letterboxd