Uh, if you want quality DOA games and you don't want to get funny looks in large tourneys in case doa5 gets accepted, then you better not fucking ask for another doaX. Seriously, knock it off. It's plain weird and creepy as fuck. Build a good image for your community. Other communities would think you're a bunch of weirdos.
If you want dating sims, go play those weird anime games when you're alone.
To be fair, the KOF series has the Days of Memories spinoff, which is a dating sim series featuring KOF and Samurai Showdown girls that has like 8 installments, so DOA isn't the only fighting game franchise that does stuff like this.
The jet ski race was fun, The volleyball could have added a little more depth, and if the actually had the characters interacting more outside of canned animations (actually talking to each other) it could have been better.
I think they should have all of the girls speak in their native languages so they have a hard time understanding each other. Then, you can pair them up and watch them lose due to the shoddy teamwork brought about by poor communication. There's another layer of depth right there. It also opens the door for a new "Bitch Slap" mini game when they start blaming each other for the loss.