I want to like this mode. The format has a lot of potential for Naval but it has a giant problem with balance and game longevity as a result.
The Battle rating spread is too extreme. Who ever gets the good battleships first is god of the game. effortlessly wrecking all destroyers and cruisers. earning enough respawn points to endlessly chain spawn more good battleships.
No one wants to join an ongoing game because they will be stuck with destroyers and low end cruisers which have no way to compete with the battleships and earn battleships for themselves.
From this point the game is just attrition. As people gradually need to leave 1 side inevitably ends up with numerical superiority and what ever is left of the other side just quits as they cant match the other teams numbers and no one wants to join an on going game.
Its a simple change. Either: Increase the minimum battle rating or Reduce the maximum battle rating of allowed ships.
This will allow people to join in progress through out the match to replace the leavers and keep the games competitive for longer