Throughout most of the Hernandez series, I've had the tagline Loyalty Above All (there are no exceptions) to symbolize that loyalty is essential to these characters. It's the backbone of the entire series, the structure that holds Jorge Hernandez's organization together.
Of course, this is an appealing concept for most people. We want to believe that others are loyal to us. We want to believe that when pushed, most people in our inner circle will be in our corner, defend us, and help with whatever we need. In reality, this isn't always the case. It's usually during the worst periods of our lives that we see the true colors of those around us. And let's face it, they don't always shimmer.
For this reason, I sense that my readers appreciate the fact that Jorge Hernandez is not only loyal and dedicated to the people in his life but that he also demands the same of them. This, along with his power and confidence, are also central in the series. No one will run over this character, and no one dares to try. But is that really because he is any less vulnerable than the rest of us, or is it because he believes that he is so powerful that makes him so?
Either way, again and again, my readers assure me that this is why they love the series. I do have a lot of stuff going on that makes it a fun read, but it's the protagonist that draws them in the most.