There's nothing particularly....wrong with Eldritch Highschool. The premise is okay, if not a bit cliche, and the dialogue and characterizations are well-structured and entertaining....no, the problem really lies with the MC himself.
As a VN with no diverting paths or choices, you're at the mercy of the plot, and unfortunately for this plot the main character is a pretty pathetic pushover. And yes, I get it, there's a plot point there that I'm sure will open up in later updates, but at the start? You're at the whim of the MC and a cast of very, very annoying female characters.
I have no problem with their designs, I actually prefer these models over most, but the girls are all so confrontational and sarcastically aggressive ( or just plain irritating ) that it's a chore to have to sit on auto-pilot and watch them step all over you via the MC.
Regardless, again, this isn't a BAD game in any way, it's just not a particularly good one either. There's also no lewd content yet apart from a few flashes of boob, so really it's just a cuck simulator.
Hopefully it gets better as it goes on.