I dont agree. I think (the 2nd of course) game is close to perfection for a vn-erotic game.
never played such good game and one reason is the choices and all the branches.
writing was also good. because it was "erotic" and that part is very hard to find.
a lot of games are visually good, tons of story but lack of eroticism.
a game that came close is "our fate - a new family" because the writer did made me feel "Im in charge, his thought, how he wanted to corrupt her, how he took his time to do it" (if u pick the corruption route like I did

)
so, sure HS is not the best visually, but what PW did with it, its simply amazing.
to explain: eroticism is not just sex, its the emotions u get from it. sexiness, finesse, the art of teasing, to make u aroused etc. its the play before the sex that is very important. "slow corruption" is all about that. not that "u need to click 20" times and the girl with suck your cock. no, its the expectations and the feelings.
in PS theres tons of that.