I will not apologise for going against the grain on this one, how do we go from the beginning of the end to the end itself - answer: with episodes like this one.
It builds the tension, the darker characters are brought into play, the Tyrol & Baltar scene was it not powerful television?... the board is set and the pieces are moving - Kara is the one that will question where we stand, can we trust the Cylons in anyway? - weren't they the ones who destroyed humanity? - are they the ones to save it?
As the very bones in our bodies require muscles to work - using tendons and fibres, so these episodes are the fibres, we need these to keep the parts together, the pay off will come, and when it does we will be greatly rewarded.
The journey has been long, but it has been worth every minute.