I completely agree with the comments previous about 'what happens in an emergency' - one of my concerns should one of these things ever have an issue.
One of the scariest things I have seen on there are the lifeboats, which are double deck loading, holding around 375 (I think) and are stowed in the launching position. No 'swinging out', bowsing tackles, tricing pendants, just take off the gripes and lift the brake, straight down. Having seen many issues with lifeboats before, I think it is a bit of a scary prospect.
The issue with the 'Star Princess' was that the fire was along one side of the accommodation, which in the event of abandonment due to the fire getting out of control, would have rendered at least 5 boats unusable. Now I know that spare raft spaces are available, but not that many! Now change that situation to the Oasis, and you have 1,875 people looking for somewhere to place their bum.....
Touching on a previous question, the arcs extending over the side at the top deck are for jacuzzis which overhang the ships side...
Cheers
Ash