Everything I dove on was completely intact, and most were penetrable, if you were qualified. I had the luxury of going with a group of 8 other technical divers, 2 of whom have been there 14 of the last 15 years, so we spent most of our time on wrecks that not everyone dives on.
It was amazing to me how little had been removed from the wrecks, and how much growth was on them. I remember a couple of deck mounted bow guns that you could only barely recogize as a gun. On the deck of the San Francisco, there are two tanks that are sort of stacked on each other, exactly where they fell 60 years ago.
If you like penetration wreck diving, this is the place for it. I didn't get into a lot of them as my wife was with me and she's not comfortable with it, but this year I plan to see a couple of engine rooms... 
Tom