If I'm going to describe Hunter X Hunter in one word I'd say it's EPIC, I love shounens and if you're going to ask me which one is my favorite I'll instantly tell you, it's Hunter X Hunter. Beware though that this might not be your taste - This is different compared to Naruto, Bleach or One Piece because it's twisted in it's way that the characters, story and how they interact are presented differently. The story starts where a 12 year old boy named Gon which was abandoned by his Father met a Hunter. This hunter then introduced to himself that he is looking for his Master and this Master was his Father which is of course a hunter too. After that, Gon then pursued to become a hunter ventured the outside world for him to become a Hunter and look for his Father.
The main story is pretty simple but that's just the outer shell,what makes it complex is the struggle of Gon when he is taking the Hunter Exam and how he met his friends and how their relationship were built. What's cool about the series is that it's full of surprises and is very unpredictable.
They focus not too much on the fights and hidden techniques to defeat an opponent but on how to outsmart them depending on the situation. The characters were portrayed as "geniuses" or above the level of the others but the anime illustrated them as leagues behind compared to the main antagonists. The series stands in the semi-futuristic setting and the anime doesn't revolve on a single society. The cool thing about this one is that they travel too much in the series which makes the anime more like an adventure. They do not do missions but the events are interrelated to their main goal. One thing that If you want less drama and pure adventure then there's no way that you'll never like Hunter X Hunter.
The characters in the anime are definitely cool but one major flaw for the hard-core anime fans is that they lack subjects for "fan service" (Bisuke won't qualify!). But anyway if this is intently made for serious viewers who do not want signs of continuous blabbing about friendship then the characters in the series is perfectly suited for the emotions and action of the anime. The supporting characters on each arc are good too, they are helpful in every way and I felt that each one of them should re-appear in the succeeding episodes.
Surprisingly when Hunter X Hunter were first release, shounens during that time focused too much on fighting and until now they still do. For serious viewers who loves shounen and just want mental battles with still appealing battles, you'll definitely love the series. No fillers and just there to give you adventuristic experience, Hunter X Hunter is slow paced but the climaxes in each arcs are well timed. Hunter X Hunter is a big recommendation! An A+ to me.