The TPB includes a short introduction how Bruce became Batman and why he does what he does. There isn't that much else to say, the rest is revealed through his interactions with his rogues gallery.
Hush was the first Batman story I've read without having too much knowledge of the comics, I've been familiar with B:TAS and the Arkham Games. IMO, the story does an okay job to explain Batman's universe in a nutshell. The identity of Hush was way too obvious and the red herrings seemed more than half-hearted. There are a lot of superior storylines out there but I enjoyed Hush for what it is.