I am sceptical if OCBC is ranked 1st. Some of the most respectable banks in the world like HSBC etc is not there. (Hang Seng excluded)
As someone told me this a while ago. He was cashing in a cheque in Zurich and the teller stared blankly at him and asked, "Is this bank in China?"

Most of the respectable banks are not there - Citibank, Lehman Brothers, Bear Stern etc. The point is, respectable in what sense? That they are in 100 countries around the world. That they have been in existence for more than 100 years - Citi, ABN Amro --- oops ABN Amro no more.
Bloomberg used the 5 criteria. And that's how the cookie crumbles. You may want to tell Bloomberg why or how the 5 criteria are used.