It's not a show that is interested in you liking it, I think. There are rarely cliffhangers, often episodes end thematically--or somewhat arbitrarily--rather than based around major plot points. It's just there to tell it's story, whether you give a Spartacus or not.
The metaphor I give people is that a show like Breaking Bad is a dog--it needs your attention, please please please; The Wire is a cat. It's gonna do you thing. Pay attention or don't.
In that way, though, I think it's a much more subtle and nuanced show than something like Breaking Bad. It's also a show where each Season tries something different. Season 3-4 is peak, so that's where you'll really figure out if it fits in your pantheon or not.
The expectations were certainly unreasonable. But I watched it for the first time after it became a myth, and ultimately thought it came close to, or met, those expectations. I think it's the best, most well-developed, thoughtful TV show I've ever seen. It'll never be Breaking Bad or GoT because that's not in its DNA, and yet its patience and devotion to storytelling itself--rather than viewership--is why I think it transcends those shows.