One of the things I really liked about BSG for the first season, and the second season, is that it was relatively straightforward for a contemporary serialized show...there were mysteries and recurring plot points, but they were pretty straight-up. For example, we new Boomer was a Cylon in season one, it was just a matter of time before that played itself out, creating anticipation and suspense. Anyway, there didn't seem to be a whole lot of trickery or slippery mysteries going on, a la Lost/Twin Peaks/X-Files/Carnivale etc. Questions, sure, but not a bunch of unexplained shit going on that seemed that it would receive a completely left-field answer two seasons later.
As of late, though, it seems that the show has abandoned any kind of forward movement or eventual suspense. Ironically, Lost--to which BSG has been often held up as a superior example in genre fiction--has actually seen much more forward movement and streamlining in its story lately. Meanwhile, BSG seems to have ramped up the tricky WTF mysteries in place of building a real sense of suspense.