Depends I think.
They could have ended DMD with Chapter 2 and nothing much would have been missing.
I didn't like Chapter 3 at all and we haven't seen that much of chapter 4 yet.
I remain sceptic that they can pull of a satisfying ending.
If the player is interested in the main story: 'Father dating his daughter', no, finishing in Chapter 2 would not be satisfactory. Lots of sexy and sexual events that could have happened would be missing.
People have their own preferences. So, some may have enjoyed Chapter 3 while others may not.
Chapter 4, since it is supposed to be the last one, is the last chance devs have to deliver an awesome 'Father dating his daughter' game. They're doing it right when they:
- Are focusing on the main characters dates.
- Create and explore new sexy/sexual situations.
- Don't create artificial difficulties for the main characters to be together.
They are doing it wrong when they:
- Throw a sexual scene at the players without a prior sexy event to create the needed sexual tension.
- Don't give control to the players during sexy/sexual events. Players should always have options.
- Don't offer oral, anal or vaginal options when a sexual event involving the main characters starts.
The last part of the game is not the part for drama or grinding, it is the part for reward and enjoyment.
I believe devs can deliver a spectacular last chapter for 'Dating My Daughter' if they focus on the main story.