I think it has a cult following, but not massive ratings. Like Mad Men. Its cultural impact is magnified by the degree to which its viewers like it, and the degree to which writers and critics and whatnot rave about it.
Breaking Bad has hardly any recognition in comparison. See this poor excuse for a thread. Like four people have seen the thing!
It just depresses me. It's totally different to Mad Men, but in terms of writing, cinematography, acting, compelling storylines, etc, it's more than a match for it.
And it's water-cooler television. I'm going to buy a ****ing water-cooler so I can stand over it and natter to myself on Monday morning. And it's good suspense too - like Twin Peaks, not like 'what's in that grate why is there a polar bear here'. It's real suspense, about characters, about their decisions, about the consequences.
In summary: "BITCH!"