I can totally understand people not getting it, it is so different from the mainstream scifi shows most of use have seen over the last couple of decades.
I'm a huge fan, love the technical aspects of the production, the characters and writing hit home with the human condition to a greater degree than perhaps most non-genre serious dramas do and all set against the wonders of the universe and a thumping soundtrack

That said it's a much harder show to rewatch than say Firefly, Trek or well anyother scifi show perhaps because it is dark, disturbing and yes depressing at times but like all dramas that take to the abyss it has it's humour and truimphs just like the real world.
It's been said before but I'll say it again, watch the mini-series and then watch the first episode proper, if you can't accept the world DRM and Co have created then go no further but if you can the first season is high quality scifi drama. The second season and third seasons expand to 20eps and suffer a little and have some mighty twists as science, politics, religion, survivial, betrayl, hope, honour, sacrifice and everyother human trait impacts on the final remnants of the "human" race.
Season 4 is fast turning into a piece of genre dramatic television that won't be equaled by more "proper" dramas for years to come and certianly not on the budget of BSG.