The first and possibly biggest selling point for me would be the characters. Each of them are unique, full of personality, entertaining to watch, and the majority come with interesting backstories and motives. Special mention goes to Gon Freecss who could very well be one of my favourite main characters in anime to this day, as well as Hisoka who is an amazingly entertaining antagonist and an overall joy to watch. Other members of the 'main 4' including Kurapika, Killua and Leorio are all lovable, and they really do add many positives to the show.
The other big positive to the show would be the story which gripped me from the very first episode. There's no straightforward way to describe it, as the story constantly changes in genre and style. One moment, it's an action/adventure, then over time, it shifts to sci-fi/tragedy. Comedy, drama, fantasy, crime. Heck, in one arc, it's even a card/sports anime! It does a good job of keeping the viewer interested while still managing to remain relatively straightforward and easy to understand.
Overall, if you have ever considered watching this anime, I'd say go for it at the soonest convenience. With 148 episodes of some of the purest fun I've had watching an anime, and with only 2 recap episodes and no fillers, it's a quality show which really deserves more viewers.
