The movie receives very good reviews, but why should I see it? Films with an Irish theme are almost always noxious; an Irish theme is perhaps the best predictor of a boring and overrated movie. The problem is that too many people will go see the film simply because they feel that being Irish, or seeing Irish things, is cool. In contrast I expect a bunch of old geezers croaking about the incomprehensible, with a sickly sweet sentimental ending, hidden under art house pretense.
Are there exceptions to the rule that movies about the Irish are bad? Scorsese's *Gangs of New York* comes to mind. Most of the other exceptions you wish to cite aren't exceptions.