What I found most interesting was that it could be read in so many different ways. More obviously, it's a guide on military and war, on how to win battles and how to efficiently make use of spies, fire, nature or the weather. But all around those aspects, the text is filled with words of advice which could be adapted to pretty much every scenario of life affected by opposition or antagonism. I can't pretend being eager to adapt those messages to my own life, and I'd definitely argue against living by the rules suggested by this book, but as a historical manuscript, it is incredibly important - and, to my personal surprise, also surprisingly short, meaning that it can be read over the course of one to three hours, depending on how fast you read and how thoroughly you want to explore the book. Furthermore, even if you may expect something completely different from such an old text, the sentences are well-structured, constructed in a very understandable way and generally very comprehensive, though that could be the advantage of the translated edition I've read.
Unless you read it for historical or educational purposes, "The Art of War" can be a very entertaining experience. The proposed tactical advices are interesting and provide some fascinating insight into what people thought 2,500 years ago - and since the book doesn't feel like it's as old as it is at all, also into how people might be thinking nowadays. My highest recommendation; this is definitely one of the important classics everyone should at the very least have taken a look at.