I was looking forward to Batman coming to Blu-Ray, I like the Nolan films just as much but find Jack Nicholson's Joker far more enjoyable than Heath Ledger's.
Warner Brothers have chosen to let the film start almost immediately, without the chance to select options from the menu; rather annoying. This also means that if you wish to watch any of the extras (there is an exhaustive library of documentaries and interviews) you have to select them from the pop-up menu while the film is running, and when you finish it returns to the film - I find that a little weird.
Image quality is very good and a huge improvement over the DVD, I'm pretty familiar with this film but found I was able to detect more emotional nuances than usual in the faces of the actors, the quality certainly seems to add something to the performances. It should be spectacular if it is ever re-mastered, but for now, it's still pretty good. I wouldn't go so far to say this is as good as Blade Runner though, which is exceptional.
I haven't heard the HD soundtracks, but the standard Dolby Digital 5.1 is a little disappointing, it's too quiet and occasionally seems to drop into mono, or at least partly, with dialoque suddenly spreading to the front left and right speakers. This may be of interest to others like me who haven't upgraded yet from their original surround set-ups for DVD.