Game of Thrones is a well-acted show with great sets, great costumes, great visual effects and interesting storylines with unexpected plot twists. Based upon George R. R. Martin's "A Song of Ice and Fire" series of books, it is, without a doubt, for mature audiences. I haven't read the books so I cannot say how strictly the show adheres to the book. I have heard, however, that it is a near-faithful adaptation. Despite all of the accolades that the show has received, there are some issues which may make viewers who have never seen the show think twice before purchasing this season three set.
First, there is a lot of graphic violence. While the setting of the show, a mythical land of kings and knights, dragons and dark forces, would seem to indicate that a certain level of violence is to be expected, some of it may be too intense for certain audiences.
Second, there is an abundance of graphic interpersonal situations and full frontal nudity, both male and female, though more female.
Third, there is a lot of vulgar language. For me, this is the biggest problem with the show. It's not that I have a problem with occasional foul language, it's that the words seem too modern for the era in which the show is seemingly set. Every time one is used, it pulls me out of that fantasy world. It breaks my "willing suspension of disbelief". Perhaps it's just me, but if they had created words, like Battlestar Galactica's FRAK or Farscape's FRELL, then I might not get that jarring feeling. Who knows.
Finally, my biggest gripe is not with the show itself, but rather with the box set of the season. The season consists of 10 episodes and there are 5 discs in the set. There are only TWO episodes per disc which means that you have to get up and change the disc EVERY TWO EPISODES. This is NOT conducive to binge watching. Sure, there are extras on each disc. There are character profiles and behind the scenes documentaries. Still, this could have easily been a three disc set (5 episodes on disc one, 5 episodes on disc two and all extras on disc three) but I feel that the 5 disc format is used so that studios could charge more money for the box set.
With that in mind, I advise waiting until it goes on sale for less than $10.
All in all, I'd say that if you enjoy the fantasy genre and don't mind some adult situations, then Game of Thrones - Season Three might just be worth checking out.