What TN could have done is added at least one or two more mini-games (preferably boat racing and the water slides) and then also made some character-specific interactions in the gravure scenes. For example, Helena and Marie Rose could frolic around near the swimming pool area. They notice there one of their chess boards and the pieces are on the table, along with some (probably) alcoholic beverages. Then they challenge each other to a game of chess. There also needs to be at least one more method of making money on the side of "Owner" mode, that way the player does not have to rely on spending too much time "watching" Volley Ball matches or relying on RNG factors. They also will not have to save scum as much. Last, there could also be some DOA match presentations (or hell, TN could port an older DOA game in to DOAX3 if they can work out some legal issues and the license for them). Or, a mode where matches from the main DOA sequences can be visualized. A connection to DOA5LR so to speak. Other aspects that could also work are adding footwear, small accessories, and a couple more swimming suits for players to mess around with as they play the game. And, perhaps one or two more characters from the main series just to stir the pot a little bit.
Then again, none of this is going to happen and everything I say may not sit well with some individuals here. The game is okay for me. It's just that, things could be a tad better but this is nothing more than a personal opinion.