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So basically the rules generally are, the show has to be on a big network or a paid network like HBO and Showtime.
Then the show has to generally stay away from interesting explorations of the human existence and just banter about the everyday crap of sex, murder, and cheap laughs.
So that leaves shows on Sci-Fi, CW, FX, TNT, USA generally off the Emmy nod list, with occasional exceptions. Plus the big networks don't want you watching shows on those smaller networks, they aren't going to give you directions to go watch them by saying how great they are.
I saw a story about how the major networks aren't getting the numbers they used too, which eventually will reduce their ad revenue, which will reduce the salaries of directors, writers and actors. None of them want to see that happen, so they want the majority of Emmy nods to go to shows that are on NBC, CBS and ABC, HBO and Showtime.
Then there are just the shows that go against the status conservative quo, so shows like The Wire and Weeds are out. People don't want to think about areas where cops make decision to stop busting dime bag dealers or a suburban mom is selling pot for whatever reasons she's doing it for (I've not watched these shows yet, they are on my Netflix listing though!)
As for JFC, I like it, but some episodes have been really really boring and I check my watch to look if it's over yet and also, the characters aren't making me care about them too much either. Mitch is an asshole, Cissy is a bitch from hell, Luke Perry is boring so is Cass, Ed O' Neil is interesting and so is Kai, but other than those folks, I really don't care if I never see most of the characters again. Heck I want the drug dealers to go away just so I can hopefully see more of Kai, Butchie and Sean.
My grandmother saw Mad Men and she says she just couldn't stomach the return to what she calls the bad ol' days, but she is interested to see how I see it since I came about 20 years after the time period this show is set in.