For me, my favourite part of Grisaia was its satisfying endings. If you're looking for good romance and decent bad endings too (except Makina's route), I definitely recommend checking this out.
There are some questionable fanservice moments (I played the Steam version without modding), but if you can look past that, my ratings are:
Michiru route: 9/10
Sakaki route: 8.5/10
Sachi route: 9/10
Makina route: 3.5/10
Amane route: 8.5/10
Makina bad end 4/10
Amane bad end: 8.1/10
There are some questionable fanservice moments (I played the Steam version without modding), but if you can look past that, my ratings are:
Michiru route: 9/10
Sakaki route: 8.5/10
Sachi route: 9/10
Makina route: 3.5/10
Amane route: 8.5/10
Makina bad end 4/10
Amane bad end: 8.1/10