Not convincing The show prepared you for a decent battle to take place between the US and the three greek ships.
However, the battle itself is a bit ridiculous. Two out of three ships are destroyed in ways that would fit a comedy better than an action movie.
The first greek ship is rushed by a rhid boat carrying explosives and approaches completely undetected (!!!) a moving warship (although it is shown as stationary in the movie) in clear weather conditions. It is hard to believe that any vessel would approach a warship like that.
The second ship is destroyed by torpedoes because of sailing in a straight line while engaged i a battle (which would never happen).
This series were never meant to be realistic of course, but in previous seasons they always found a clever and convincing way to show these battles as instense and difficult. In this case, it seems like a walk in the park to destroy two of three ships, which was a bit annoying for those who expected a real battle.
In addition, they could find one or two more native greek speakers, as the majority of greek dialogues doesn't make any sense.