When it first came on I mistakenly believed it to be another reality show and, although I intended to check it out, never got around to it. Thanks to my son, I was able to watch all the first five seasons over the last few months "with" him and discuss them online - now I'm as hooked as he is.
(And my son and I have an agreement not to look at any spoiler sites or news or anything that might spoil upcoming eps for us
)