I don't think anyone has mentioned Ready Player One by Ernest Cline. Great read, and an unabashed love letter to gaming and 1980s pop culture.

You're comparing a book to what I assume are either video games or a manga adaptation, which seems flawed. Regardless, I agree that Harry Potter is... I won't call it overrated, but by the end it was running almost purely on its own hype train, and Rowling could have released a turnip and stamped her name on it and still enjoyed massive success. Fortunately she didn't, and the last books aren't bad by any means, but they did become rather dry. I always felt the series suffered in its transition from children's book to teen/young adult - necessary with its fan base growing older - its more seriously-toned plots jarring in a world originally conceived as rather madcap and childish.