This is a nice & welcoming read for pretty much any reader. If you're interested in Superman, you can pick up the book and go along without a problem. There really isn't anything in this that you won't understand, even if you basically know nothing about the man of steel.
The book is divided into four chapters, each corresponding with a different season, while also each being narrated by key people in Superman/Clark Kent's life. The first being narrated by his father, the second being Lois Lane, third Lex Luthor & the fourth being Clark's childhood sweetheart, Lana Lang. This book isn't the most action packed, so don't go in expecting that, but it really doesn't need it, and it never drags at all.
The book focuses on explaining why Clark, a man with almost endless powers, far more than anyone, including most other comic characters, would use his abilities for good, and further, why he would still despite saving thousands of people, would feel he's a disappointment, who isn't doing enough for the world. It's a really touching story, and shows a side of the man of steel that is often overlooked. This isn't your mindless, careless, and pretty close to useless Superman, like in Zack Snyder's Man of Steel film from last year.
The only negative feeling I have towards the book, is it's very much about who Clark/Superman is, but we don't actually hear a lot from Clark himself. I think to myself I'd like if Clark narrated the last chapter, but thinking back it makes so much more sense that Lang was the one to narrate it. I'd just like to have heard more from Superman's voice.
I haven't read a lot of Superman comics, I've read some of the 90's stuff, and I've read some of the New 52 stuff (very limited in both), this was my biggest dive into one of Superman's comics, excluding Mark Millar's Superman: Red Son. It didn't knock me out of my seat as I have been with other comics, but does shed light and make the hero, who's often criticised for being too good, or too strong, which ultimately makes him dull in the minds of some. I've often held the thought that it's hardly ever the powers that make the superheroes interesting, but instead the character, and anyone who's experienced this comic, I think will have a greater appreciation for Superman.