TLS was good the first season and ok the second season. So far the third season sucks IMHO.
I told friends that the Achilles heal of this show is that it is limited to coastal locations; they can't do heartland where a destroyer can't go.
The seasons are only 10 episodes long, so they do have to jump right into the action. This season, the story is that the virus has mutated and is now killing the plant life. However, the early episodes are dealing with intrigue instead of warship action.
So far...
-PJ