OK, I'll start by saying that I'm a runner myself and a fan of Paula's (although I'm not a die-hard, member-of-the-church-of-PR kinda fan).
I found it great to read about her childhood and her background as a runner - she really was the underdog for quite some time! Getting a (tiny) glimpse into her training schedule also interested me (for obvious reasons), and also the ice-baths, nutrition, etc. But she clearly adores running.
She seems to have suffered countless injuries. This is probably common in elite athletes, but reading about how often they get them makes you wonder how fit these people really are! I mean, these professional runners are plagued with injuries, while the average overweight middle-aged person manages just fine!
Paula also, obviously, talks in detail about Athens and how it all went wrong. It's pretty upsetting to read - but it was upsetting to watch, too.
She also has a great, not-too-detailing writing style.
I liked it.