Absolutely nothing can really convince you what a great piece of storytelling it is other than your experience reading it. I was the most jaded and illiterate little snot-nosed jerk when I decided to pick it up when I was 13 or so, having read an impressive article about it in Entertainment Weekly, and seeing that Joss Whedon and Kevin Smith liked it as much as they did.
Then I read the first chapter. And things changed. It's not a boring read, nor is it action-packed or explosive or anything that necesarily says that Zack Snyder should direct it. This book will soak you up entirely.
If you like superheroes or comic-books, you'll like it.
If you hate superheroes or comic-books, you'll like it.
If you enjoyed The Dark Knight Returns, you'll like it.
If you are literate, you will like it.
If you like stories that talk about politics, the human condition, power, and the end of the world, you'll like it
If you like Bob Dylan, Indian food, Mars, watches, or Alexander the Great, you'll like it.
If you have a Brain Stem, you'll like it.
It's not a long read, man. Shell out 17 bucks and get a copy. Worst case scenario, you didn't like it and feel like you wasted your free time. If that's the case you can return it. But if you do like it, It's a book that'll stick with you forever. And you'll find the movie all the more enjoyable.
Take the risk man. Find out what the world's been talking about for 23 years. It's worth it.