Okay, episode four watched.
Overall not bad. Definitely a departure from what they were doing as the lack of maintenance (due to lack of a functioning support vessel/yard and spare parts) caught up with them big time. Most of what they showed was fairly realistic (like using stills on every liquid they could to try to distill some more drinking water). The bit with sails is okay conceptually but I think they would need more of them to get any speed (granted they only said 4 knots and the hull of a Burke is VERY streamlined underwater) and conceptually if they can make the screw turn enough they would be able to get a little power from that turbine as its power generation ability comes as a side effect of its turning.
They still kept the interpersonal stuff well under control, and the group prayer on the ship is far from uncommon in the Navy - I participated in a couple myself when we REALLY needed something to go our way.
On the other side, the pacing was a bit slower than we've gotten used to and this episode was definitely not Science Fiction - if anything it was sort of a survival drama. Acting was still very much up to par and the characters are both consistent in how they act and are developing over the course of the show.
I have not seen it yet. Im downloading it now. Regarding prayer on ships, this is also not at all uncommon for every branch in every aspect of the military including Boot Camp. During my military enlistment, I identified as Christian and participated in prayers and services (the alternative was polishing brass or sweeping up the barracks). I'm a little concerned by the mention of sails. I need to watch the episode before commenting further.