Parts 3 and 4, while not as enthralling as 1 and 2 are decent entertainment all the same. The fleet of ships reported lost or destroyed operating covertly in Cylon space is a cool idea. I also like that we're finally seeing other Colonial warships that aren't battlestars.
The Osiris itself seems like they're trying to go for the same kind of atmosphere they did with the Demetrius in season 4. Cramped and cluttered interior, everyone wheres the casual uniforms and appear to be dirty and or sweaty.
Recycling actors continues. The Osiris commander is Sgt. Hadrian, Captain Kelly is a bridge officer, and Narcho plays another Viper pilot.