Schoolmate 2, Artificial Girl 3 and Artificial Academy was how I first got into 3D eroge. For a long time I looked forward to almost every new Illusion release.
I think if they had just focused on what people wanted rather than go back and forth between anime-esque games (AA2, Koikatsu etc) and copy paste realistic games (Honey Select, Room Girl etc) they would've been better off.
I personally feel like their realistic games were boring and the biggest offenders because the gameplay was completely barebones and there was pretty much no position variety between the games. No one wants to play the same game over and over with a different name and setting. While there wasn't much of a difference between Koikatsu and Koikatsu Sunshine the latter at least offered more position variety. The same can't be said for games like Honey Select, Honey Select 2, Room Girl etc.
Oh well. It's a shame but it is what it is. I'll miss what the company used to be and not what it became.