Harry Potter

Harry Potter is a novel series and media franchise created by British author J.K. Rowling. Taking place in the universe of the Wizarding World, the series follows the titular protagonist, a young wizard, and his friends at Hogwarts School of Witchcraft and Wizardry as they fight against the evil Voldemort and the forces of darkness throughout the years. The series has enjoyed immense success, becoming the highest selling book series of all time as well as receiving strong critical reviews and a large fanbase.

Plot
Harry Potter lives a meager life with his negligent and abusive extended family, a life of pure hatred and never having enough of anything. One day, he's accepted into the prestigious and mysterious Hogwarts School of Witchcraft and Wizardry, learning that he is, in fact, a wizard himself as were his parents. Throughout the years, as Harry makes new friends and learns the magical secrets of this world, he also learns of the evil Wizard Voldemort and his personal ties to him, and his destiny to save the Wizarding World.

Why it is truly Magical

 * 1) A very appealing writing style that's not too descriptive to the point where it becomes boring nor too quick to the point where it becomes confusing. It gives a lot of detail into the scenery, the world, and the concepts of magic while the pacing is also decently fast throughout despite not having a whole lot of action, keeping even the most non-committal of readers engaged throughout.
 * 2) The Wizarding World is easily one of the most detailed in all of fiction, which is equally impressive because a lot of the stuff put into it might seem random or overtly magical, yet fits in very well with the world as a whole due to Rowling's writing style making it fit in perfectly. It's pretty much a world of just insane amounts of imagination that's as much fun to read about as it is to watch. It's also a world with a ton of rules and politics in it, how certain deadly spells are illegal and could lead to one's immortal soul being tarnished and the like, and how they try to keep it a secret from Muggles or normal humans.
 * 3) A massive cast of likeable and well-developed characters, and plenty of them are actually given importance to the plot and even those that aren't are still likeable and interesting.
 * 4) Harry is a devoted student, but also someone who's been deprived of many pleasures in life, which he seeks to attain with his newfound freedom. He also has the innate desire to do what is right even if it's against school rules and to help others even if he doesn't get along with them, and is quite insightful and smart as well. He's also fearful of Voldemort due to the latter murdering his parents and nearly murdering him, but rises to the task and tries to fight back against him.
 * 5) Ron Weasley comes from a larger family of talented wizards, his father being rather obsessed with the Muggle world and many parts of it. Though he's seen as rather backwoods, especially by "pure" wizards like Draco Malfoy, he's still a competent and talented student as well as a highly devoted friend to Harry and others.
 * 6) Hermione Granger is of Muggle birth and as such is even more devoted to her studies as a wizard than many others. She often comes off as a condescending know-it-all, which makes others dislike her, but she still provides plenty of great help to others and is still capable of making genuine friendships, particularly with Harry and Ron (the latter of whom she eventually begins to fall in love with). She's also more stringent about obeying the rules to avoid expulsion from Hogwarts, but still rises up to the challenge when necessity demands it.
 * 7) Albus Dumbledore is the head of Hogwarts and is devoted to his students to a tee. More importantly, he doesn't show favoritism to Harry and treats all his students equally despite Harry's status. He's highly knowledgeable about magic and is devoted to upholding all the cardinal laws, and makes plenty of sacrifices to himself for his students and staff.
 * 8) Severus Snape may be rather condescending to Harry and a rather intense teacher, but he's also a highly devoted one and has a good reason for his attitude. He also has an interesting dynamic with Harry, being that he hated James Potter for bullying him but loved Lily Potter and was the one who brought her into Hogwarts. He's also a highly complex character as what may seem like an evil action on his part is actually done for the greater good, showing that he's not evil as he may seem and is actually quite good.
 * 9) Rubeus Hagrid is a former Hogwarts student who was expelled for breaking the rules and lost his wizarding powers. Nonetheless, he teaches some classes at school, particularly about monsters, and being that he was good friends with James and Lily, he is utterly devoted to Harry and giving him a proper life. He's highly sympathetic to many creatures as well as his students and helps Harry when necessary.
 * 10) A very well-written story that takes place over a number of years rather than a few or even one. It also uses the magic and the rules therein to the fullest extent possible, having plenty of important plot points centered around it like the benefits and limitations Harry and Voldemort have on each other and how the latter's actions also affect the Wizarding World very deeply even years apart. It also has all the characters age and grow as time progresses due to every book being one year apart.
 * 11) There's also plenty of slow buildup, where the first few stories are deadly threats to the characters but minor threats overall, though later books have the tension constantly escalate with the threat of Voldemort's resurgence and his attacks on the Wizarding World afterwards becoming more severe and deadly.
 * 12) It's a very interesting idea to have a fantastical magical world mixed in with the down-to-earth real world, especially when it chooses to touch on plenty of aspects of life in the Wizarding World, consumerism, different and unique kind of foods, new creatures, different kind of education, ways to get there, and social behavior and the like, making the worldbuilding extremely highly detailed.
 * 13) A pretty good mixture throughout it's storytelling of humor, school drama, and even thriller portions as well as an epic and large-scale tone throughout, especially towards the end.
 * 14) It spawned a metric ton of cultural themes, like platform 9 3/4, Quidditch, Butterbeer, and so on, things that even people who aren't die-hard fans would probably know about.
 * 15) It also spawned one of the highest-grossing and most beloved film franchises of all time, which continue to be beloved to this day even if the Fantastic Beasts series hasn't been as well received.
 * 16) A well-written and highly satisfying ending to a seven book series, one Rowling had planned all along and is great because of it.

Bad Qualities

 * 1) Even with all the things going for it, it's still definitely not a series for everyone as some may simply not be interested in it or it could be too detailed.
 * 2) Some VERY unlikeable characters, especially the Dursleys who favor their spoiled son and abuse Harry despite him literally being family. Dolores Umbridge is one of the most hated characters in all of fiction because she's a pathologic liar, abuses the children, and even breaks the very laws she vowed to uphold at plenty of points, even flat-out siding with Voldemort eventually. Fortunately, this is 100% intentional and these characters aren't meant to be likeable at all, and they all get their comeuppance at more points than one.
 * 3) The Malfoys are also pretty unlikeable, but they at least get plenty of character development and make the right choice eventually.
 * 4) The structure can be somewhat repetitive as most of the stories rely on Harry going to his next year in Hogwarts, learning a long-buried secret, and fighting a servant of Voldemort.