The beginning of the season is surprise to the audience, jumping months ahead in time from the last moment of the previous season ( which had the Cylons arriving at New Caprica to take control ). The first few episodes show the desperation of some characters planetside, while Big Adama tenaciously tries to get Galactica and Pegasus trained for an attack to return to New Caprica to rescue those left behind.
The rescue finally comes in Exodus, pt2, with lots of explosions and Adama's bold plan put into place.
The next five episodes are mostly characters tending to emotions, a few more of the moral/ethical crisis moments that often happen on the series, and some action toward the fleet heading to earth.
In the next four episodes ( The Passage, Eye of Jupiter, Rapture, Taking A Break.... ) the fleet finds a planet with a hidden temple that apparently was left by the thirteenth tribe; unfortunately the Cylons happen to also show up, soon followed by an even more potentially deadly problem.
After surviving that crisis, which features the retrieval of Baltar, the next four episodes basically fill as filler, again more of the moral/ethical crisis situations than storyline progress, except for a big problem that Starbuck has.
The last three episodes really roll ( Son Also Rises, then the two episode unit Crossroads ), with one situation resolved in part 2 of Crossroads but a new group of cliffhanger situations arise.