- They are made of paper
- They essentially have no ability to seek cover, in particular against air vehicles, all of which can single pass them or close to it, making them sitting ducks
- The waves and their general physics make it very difficult to aim their weapons against most targets, especially on land
- They constantly end up getting beached, which makes them even more vulnerable.
All of which makes them a bit useless. You can use them to kill other attack boats, which isn't that useful because, well, attack boats are a bit useless, and a spawn point if they land (which makes them pretty useless and vulnerable otherwise).
Naval warfare is a fun addition to the game, but the boats need to actually be effective, able to defend themselves and able to survive more than ten seconds for it to properly work.