[Sailor Steve]

The biggest complaint about SH2 was the lack of replayability; that is all the missions were scripted. The odd thing is that in DC it was the same, but it felt more realistic that way. Part of this is because submarines were told to go into enemy territory and sink ships, which obviously a lone destroyer couldn't do. This meant that the missions were either simple escort missions or you were part of a group.

Also, DC allowed several campaigns to be stored at once, so you could have several campaigns at once.

Also mentioned is the multi-play. You can actually play DC and SH2 against other players, and as mentioned you could also write missions that let you play against other destroyers. Much fun, especially with the mods that let you run battleships (not to mention the WWI mod).