I mean, it's not BAD but it's far from being good. In AA2 (Artificial Academy 2), you can create your school, students and then just sit back a watch them do their own thing. Depending on status and other factors, they may either rarely come up to you or constantly come up to you. Give a girl enough status and she'll come up to you out of nowhere, being the first time you interact and ask you for sex. They'll get into relationships, keep track of others' relationships, have sex, cheat, fight or even kill one another. It was a fantastic H sim game.
Koikatsu on the other hand LOOKS better but has absolutely nothing that made AA2 great. It's based in an all-girls school (with the single boy to judge how it goes trope) instead of a public one, the girls do their own thing but other than masturbate or have some yuri action every now and then nothing really happens. If you don't take the time to interact with the girls, they will never interact with you regardless of their status. So going from AA2 to Koikatsu seems like a graphically upgrade but a content downgrade.