#1 The wrestlers

The wrestlers are essentially the soul and spirit of any promotion. While WWE has a wide range of talented personalities, the talent is rarely tapped into, whereas NJPW knows who their stars are and how to get the best out of them.
Unlike wrestlers like Roman Reigns and Jinder Mahal being shoved down the throats of fans weekly, NJPW books Superstars the fans love.
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Tanahashi as a true brave babyface, Okada as a dominant face who often uses heelish tactics, Naito as the charismatic heel, Suzuki as the unforgiving one, have been booked perfectly.
One more factor in making the wrestlers and the promotion incredibly popular is the factions that are present in NJPW. Being in a certain faction will help fans understand what a certain wrestler's ideals are, whether they are heels or face, whether they fight with honour or dishonour.