Fantasy literature, especially High Fantasy is a well worn genre of entertainment and frankly, an overused and abused one. There are literally countless Fantasy books and series out there, with only a very select few that rise to the top of the pack, via word of mouth, reputation and unparalleled quality. Fantasy is similar to Horror or Westerns in that there is SO MUCH of it available you can fall down a hole of mediocre books, films and/or TV shows and kind of forget why you started consuming it in the first place. Periodically though, a book, film or TV show will come along and really blow you away - reminding you what that particular genre looks like in its purest form.
Fantasy's kissing cousin Science Fiction is similar in this way. Recently I had the pleasure of reading a series called The Expanse which did for SciFi exactly what the Riyria books have done for High Fantasy. They reminded me exactly why I fell in love with the genre originally. Without treading close to spoilers, here's why that's the case.
These books use the conventions of Fantasy and even what could be considered cliches... but in such a way that they are elevated to a supreme and shining state of being that reveals most other works in this genre for what they are: pale imitations of the real thing. Yes, there are Elves and Dwarves and sword-wielding Knights on secret missions. Yes there is magic and palace intrigue, political machinations and back-stabbing of the figurative and literal sort. There are plot twists, surprise reveals, deep characterizations, plus complex micro AND macro relationships abounding. But none of these are handled in they way you are probably used to. They are both better and more fulfilling than 98% of all Fantasy I have ever read. The Riyria books deserve to be on the highest shelf of Literary Fantasy Fandom. They are THAT GOOD.
It all starts with the relationship between our partner protagonists, Hadrian and Royce, but it continues with each character introduced, from the main cast to throwaway characters. In fact, while journeying in this world you never quite know which is which. However all the characters are fully formed and a joy to read. From the baddest of the baddies to the best of the heroes, everyone involved is interesting and I haven't been bored once. Sullivan does tend to 'back load' his stories but that doesn't mean they drag. It just means that when you get to the final 50 pages or so of one of these books, hold on to your dust-jacket... because the hits just keep on coming. This guy knows how to write a rollicking good tale. He has a deft hand at plotting and you can really tell that he enjoys the setup just as much as the payoff.
It's an absolute joy to finish a really great book and know that you have a whole series of great books ahead of you. Michael Sullivan has crafted a complete story arc stretching over the entire series that ties together beautifully. You can start reading the first book knowing that the whole thing is going somewhere specific and that you are in very capable hands. One of the deadliest sins that Fantasy commits is starting off amazing and then just kind of wandering off in random directions, never fulfilling its initial promise. Most Fantasy fans have had the experience of getting four books deep into a 15 book series and realizing that the author has already given up. You don't have to worry about that with Riyria. This is a pretty rare quality for multi book series in ANY genre so if you are looking to get lost in a cohesive, fully-formed world and stay there for a while, this is your series.
Probably the biggest compliment I could give any author is the accolade of making me feel like their characters are actual real people, and their world is a real place that the author is peeking into and reporting on. That's how these characters and this world come across... fully realized and infinitely detailed to the point that it's just an astounding feat of creative writing on the part of Michael Sullivan. You get the feeling you could approach him and ask any question you wanted about the most obscure character in these books and he would have the perfect answer ready. Since these characters feel so real and the flow of the story feels so natural, it makes the twists and turns just that much more thrilling and entertaining.
So to sum up here even if you aren't a big fan of Fantasy you should really read these books. I have absolutely nothing bad to say about them, except that at some point they end. You should especially read them if you have grown tired of Fantasy and/or feel that the genre has gotten stale. By the third or fourth chapter of the first book, you will get that warm, fuzzy feeling and be really happy you picked them up.