I love playing DD's in all battle modes, but as has already been stated, with the new era of CV's it is near impossible to have a good DD game at the higher tiers. I find myself limited to the lower tiers if I want a good game.
As for CV's being back in ranked, all you will find is matches will be won by the team with the best CV player, everyone else may as well just sit by their CV till the end of the match.