The main problem is too many passive players who go into farming mode from the start. The saving star punishes the aggressive player who tries to get a cap.
Let's consider qualifying for ranked battles:
1, open sea map with a circle
2, the ship must enter the circle within a specified time; DD 60secs, BB 120secs (exception CV although it would be funny watching a CV do this )
3, a ship must achieve a minimum damage threshold within the circle
4, Once points 2 and 3 are completed in five battles they have qualified for ranked Win or lose
The point of this exercise is to get players engaged in combat from the start.