You have to try it! This is the best AVN that exist.
At first I also thought HS's art style was pretty monotonous and boring, but that turned out to be a big mistake

And most games have an even better story than most RenPy games. So you don't read a game just for the sake of.... well you know what

My top HS games that i recomend to try
1. Eternum
2. Ripples - it's quite different from Eternum in art style And the story is a very good one, to say the least.
3. Wild Cats - It's new game and with unique even for HS art style. Especialy on the preview. But the story behind the game is very decent. But someone MC or even LI could irritate specifically at the start.
4. Sicae - Decent story. Not so good art as the first 3. But dev upgrade his skill and make new update better and better. But don't catch on the preview's. It's realy look gorgeous but u will not see this quality in the game

5. Companion of Darkness - unique story with lovely characters. Art is so-so.
But if you decide to start, only think about Eternum or Ripples. Most likely Eternum because it has better art than Ripples from the start. And it gets better and better after that. And if you decide to play it, try to find version 0.8. There was a problem a few weeks ago with Caribdis having to remove a lot of songs from the game. They replaced them with really good ones, and even some of them are better than the original ones, but not all of them. So if you want to try what the developers have been doing since the beginning, I recommend trying the songs from before.
There are few other HS games that i didn't mention that are quite good too but i didn't try it yet. Such as - My bully is my lover, Pale Carnations(not recomend to try this first unless you are a fan of Euphoria), Once in a lifetime(previous game from Caribdis)/and maybe others