I hope the story will start detaching from the anime soon... Because let's be honest, High School DxD isn't loved for its story but for Rias's tits and her amazing underwear collection
What do you dislike about the story? I hate the anime because it is all teasing and blue-balling but I didn't dislike the story itself, I only wished all the teasing was not for nothing, which is exactly what this adult visual novel is, the original story but without blue-balling us, what is there to dislike? 😁
When it tries to be serious because the serious scenes are either ruined by having no build up (Asia's fake out death in episode 5 and basically anything Asia related because she's the least likeable female character with a full name - I personally don't like her) or ruined by "comedy" (retcon of the last 4 eps of season 3 when they resolved the issue with Oppai Dragon song).
Most of it just isn't memorable.
There are no right or wrong opinions on whether or not you like something and to be fair highschool dxd's story did suck, it sucked bad, the fan service was the only good thing. They had a cool idea but they executed it terribly in the anime. Theres no actual deserved growth in Issei at all, whenever an opponent way stronger than him shows up he is either saved by someone else or just instantly unlocks a new power. Only a tad bit of actual character developement and actual relationship focus. It's filled with power creep but it ramps so fast it's more like a power curve wall with each new enemy being way stronger than the last. Even though it's quality is low due to everything they did poorly you are free to like it, but there are standards to rate shows by an this show scores very poorly for quality.
To be completely honest, the Novels were great and that's basically all story with little to no art. Anime adaptations (specially at that point in time) weren't known for being all that accurate, so I think the show did lack on some aspects, but still second season kinda picked the pace up. A shame it went downwards after that.
My point being: yes, the story is enjoyable and lighthearted, no need to nitpick on the power scaling when it never was the focus of the series. There are far worse contenders even in modern times, but I do agree the anime could be better adapted
I couldn't imagine watching HS DxD solely for "Rias's tits". It was my first anime and I liked it because I thought Issei "the MC" was funny. The idea that a guy could be so obsessed for boobs that he would suddenly say out of pocket things made it very entertaining. Your comment towards Asia is completely biased but everyone's entitled to their own opinion.