I also don't understand the hate. S1 is kinda a slog. It doesn't really get good until you're in the late game, and then it's excellent. S2 immediately resumes, and improves upon, the standard of excellent sex. S2 does cut all the stupid puzzles; is that what the people miss?
This game has some of the hottest scenes I've ever seen in an AVN. It's worth playing, especially since the S1 apk includes a mod that helps you 100% your playthrough in one go. I think the devs have their head on straight. They continue to produce really good content.