Here are some important thing about why we love Miraculous Ladybug.
The Unity in the Fandom
Even during ship wars, we are all one. Literally. If someone ships LAdrien, it's the same as shipping LadyNoir! Same case if someone ships MariChat, you don't have to fight because MariChat and Adrienette are are the same people! The ship's are one. In other shows, four completely different people are shipped and compared.
Fan 1: Tiffany and Johnny is better than Carla and Tim!
Fan 2: Maggie and Mark will be prom king and queen.
Fan 3: Jessica and Bryan don't stand a chance against Carla and Tim!
*fans tearing at each other in anger and disagreement*
Fan 1: Adrienette is the best!
Fan 2: MariChat is the best!
Fan 3: They're the same people, all ships are the best!
Fan 1: Yeah, you're right.
Fan 2: Sorry. We won't fight again.
*fans hug and go do a cosplay*
Plot and story
The plot and concept of Miraculous Ladybug is better than most superhero shows. In the other superhero shows, the hero and villain usually get their powers either biologically, through technology or by some freak accident. Miraculous doesn't have any of that. It made a new kind of a superhero origin.
Spiderman. Bitten by a radioactive spider in a laboratory. Makes tiny spider web cannons and attaches them to his wrist to weave webs.
Batman. Witnesses parent's murder at a tender age and vows to avenge them by becoming a self trained superhero. Uses highly developed technology from his own company, Wayne Enterprises.
Ladybug. Magical earrings with the extraordinary power of creation given to her after her qualities were tested. Uses Lucky Charm and help from a kwami.
Even the villains aren't boring or too terrifying. And though they're evil, they have a purpose.
Joker. A normal man who goes crazy, steals technology, and modifies it to be clown themed. Enemy of Batman.
Poison Ivy. A girl that gets mutated by mutating plant dust and gets the ability to control plants. Enemy of Batgirl/Batwoman and Batman.
Hawkmoth. Finds a superhero's Miraculous and uses it for evil. Creates other villains to challenge the heroes. Enemy of Ladybug and Chat Noir.
Sidekicks and hero helpers
Sidekicks are generally there to assist the main hero, but Miraculous doesn't lower Chat Noir that much. Although he looks like a sidekick, he's actually the partner. He does an equal amount of work and has saved Ladybug on numerous occasions. Other shows don't really show much of the sidekick.
Robin. (Dick Grayson) A circus performer's son who watched his parents die in a planned accident. Taken in and trained by Batman. He goes with Batman on missions but isn't shown as much respect as Batman himself is.
Chat Noir. (Adrien Agreste) A normal teen boy that gets a magical ring that transforms him into a hero to help save Paris. Ladybug sees him as her equal and he sees her as an equal too. It's a fair partnership without any imbalance of respect for either one.
The cheerfulness of the show.
Most superhero shows have a darker, broodier tone where's there's death and destruction most of the time. In Miraculous, there is destruction, but the characters aren't so depressing.
Superman. Very serious about saving people and almost no time for fun and jokes.
Batman. Doesn't even smile once. Super broody and dark. Never cracks jokes and always dead serious about everything.
Chat Noir. Dark powers but cheerful pun master. Always drops in a joke or pun every now and then to lighten the mood. Good for keeping away depression.
That's all I wanted to point out. If there's anything else you'd like to compare or say, you can do that in the comments!