Although I can’t vouch for anything beyond the second season, Mendelsohn’s critique seems fair. (via)
Worst of all—in a drama with aspirations to treating social and historical “issues”—the show is melodramatic rather than dramatic. By this I mean that it proceeds, for the most part, like a soap opera, serially (and often unbelievably) generating, and then resolving, successive personal crises (adulteries, abortions, premarital pregnancies, interracial affairs, alcoholism and drug addiction, etc.), rather than exploring, by means of believable conflicts between personality and situation, the contemporary social and cultural phenomena it regards with such fascination: sexism, misogyny, social hypocrisy, racism, the counterculture, and so forth.
A few years ago, I read a collection of Mendelsohn’s criticism, most of it anyway, and found it quite enjoyable.