IMHO, Farscape was very non-casual viewer friendly, in a way that BSG and some other shows were not. I watched the first season and liked it. I missed a few episodes in the second season and was occasionally confused at some character changes. However, due to schedule restrictions (this was pre-Tivo), I ended up missing plenty of episodes. Every time I tried to come back, I felt more and more lost. Who's THAT guy? Why is she kissing him? When did HE join the crew? When did HE leave the crew? Why are they attacking? HUH? BSG is usually self-contained, has a good meta-plot intro every episode and reminds you periodically of the critical information. That's neither good nor bad...but it makes it much easier to get into the show.
As for originality? Farscape had some very original takes on the classic plots (the bodyswitch episode, the time-loop episode, "I'm not trying to fool you...I'm trying to drive you crazy!"), made all the more interesting as shows like Voyager stuck to the old canards.
BSG, by the same token, has original takes on much of the matieral and how it approaches it. The religious aspects of the show are very much unexplored territory for TV SF, as are many of the deeper philosophical topics. It's been done before in different places and different ways, but not so successfully and with such a deft hand. B5 is one of the few other shows to tackle relgion so competently in an SF context, IMHO.