It's not an easy read, because the style is so peculiar, there's a ton of characters, and... well... it's not a culture I'm very familiar with. But it's still fascinating.
There's a movie that was made after this book, it's called Red Cliff. It captures the battle of Red Cliff, a peak moment in the book, and the events leading up to it. It's hugely, hugely EPIC. I'm a sucker for this genre, so I loved it. Also, it convinced me that John Woo can make great movies - when he's at home, operating within the realm of his native culture. When in Hollywood, he seems merely okay. If you watch this movie, make sure it's the original two-disk version, not the abridged single-disk one. The events depicted in it have a factual basis, with the required dramatic embellishments on top.