I really hope that the 4th season will be the last.
I started watching BSG because of its awesome atmosphere and drama. It was something new, different from the other sci-fi series. All 13 epizodes in season 1 were bloody good. Season 2 and 3 proved, that "more" doesn't mean "better".
Now we have 20 epizodes in each season, but only 13 of them are good.
Also, in the season 1, Cylons and their motives were a complete mystery back then, they were dark, deadly and very scary foes. Now, when we learned a great deal about them, they are not as scary anymore. Also, I am getting bored by the constant whining of the civilians. You're running for your lives, you idiots, so stop pretending you have right to live in luxury.