Dubai came second because it topped the list in affording luxuries (such as a live in maid) and for earning potential. If they took into account the things Shinjuku asked about, it would not have rated against NYC, Singapore or London. So it all depends what you're after. Do you want somewhere you can afford a nice car and a maid, or do you think you can't live without the cultural side?

Dubai is more interested in making itself the shopping and financial hub of the world. Abu Dhabi are the ones trying to make itself the cultural hub of the Middle East. I'm sure with time, this side of things will improve in Dubai, though.