Can you have a TV series in which every character is hateful?

Started Season 3 of "Mad Men" (and they're already advertising Season 4). It's like watching a house fire or a train wreck. Everything's horrible, but you can't stop watching. I suppose it's a great show - I'm still in for it in Season 3 - an unquestionable well acted, written, and especially designed. But how can you build a whole show in which every single character is unlikable? You'd think it's impossible. Here in first episode of Season 3 Dick Draper, after coming back home to his (pregnant) wife and being really sweet to her in first scene, goes off on a business trip and has sex with (or begins to, until a fire alarm goes off) with a flight "stewardess." Sal, the art director, maybe the most sympathetic character, still hasn't come out, even to himself, that he's gay - but Dick sees Sal in his hotel room with a half-naked bellhop. Uh oh. In the spirit of the show, he will probably use that information to gain some advantage over Sal, when needed. Meanwhile new British ownership fires longtime employee and promotes to young execs (the hateful Peter and the feckless Osborne?) to be co-chief of accounts, hoping they'll fight to the death. Peter, the most unlikable of them all, no doubt will do some really dirty stuff to best his rival. That's the way this world is, a teamwork of hate and contempt. Doesn't sound like anything you'd want to watch, right?, but so easy to get hooked on it - sometimess I guess we just want to root against someone else, everyone else.