It's kind of hard to have a marathon about that many episodes. Grumble grumble grumble.
As to the comment about Serenity being incomprehensible: my own experience is that a few people from the office went to see it. I asked them what they thought and they said very good and then they'd heard there had been a television series made from the film [sic]. Not quite I said; would you like to borrow the DVDs? Result: a whole office full of Firefly converts.