My experience from Jan 09: I didn't see any issues which would make me recommend avoiding the boat. The area described does exist but I stayed away from it. The boat has some miles on it, but appeared to be well maintained. We had no problems and lots of crew is mandatory in Indonesia. This is Indonesia so it's a Phinisi type boat and so it's Indonesia style.
The deck on the boat had rubber matting covering all the walkways and main deck area around a large table, used generally as dinner and assembly table, except a strip of raised deck down the center. The raised deck could definitely be slick. You had to watch your footing and not run around on that area.
The deck area referred to is probably that just in front of the mast. The general open area/gear up/dining area was bordered on the bow end by a mast and lines running across the boat for hanging wetsuits,with the suit rinse barrels next to the mast. On the bow side of the mast (on the other side of the clotheslines), the deck does curve upwards and can be slick. Can't dispute this isn't a slick area, but I avoided this area by approaching the lines from the stern side of the lines to hang my suit. Sometimes I had to deal with this area, but just took care. It could be possible to fall here. I wear ratty slippers after every dive because I smash my feet on the deck stuff. They can help.
I found the steep stairs between decks, down to your rooms, and up to the top room, more of a problem due to the volume of use. Take them backwards like a ladder. My wife fell down them. It could easily be ugly. Clamp on the railing because this is a boat and it does move.
Don't pick the best room unless you want to be at the end of the pendulum.
The majority of the time we were diving during the day or even moving, seas were calm. We had a few times at night of pretty heavy storms while crossing, but other than serious bobbing, we seemed OK. The only problem really seemed to be it would slow us. Luckily of course.
All the diving is from metal skiffs. Easy walk up ladder on the back.