It's one of my favorite shows because it's at least plausible, and felt that way even before the 2013 revelations. A lot of the tech and storylines in the show are of course fictionalized and a bit "out there", but the core concepts it presents are at least within the bounds of possibility. I tend to view it both as suspension-of-disbelief popcorn entertainment, and as a telling allegory on today's surveillance state.