Dubai is a playground, business deals are definitely completed there and it is home to many millionaires - but it is still a very fake country. No big businesses are going there to setup their main headquarters and store money within the reach of the UAE authorities. The mindset has shifted slowly, but there is no getting second citizenship in Dubai, you will always be an outsider unless you were born their and their citizens get a lot of perks thanks to this. It has a very biased and heavily religious influenced legal system which is not acceptable for most mega scale business dealings. If you go into debt in Dubai, you will be jailed until you pay it off, this is not a normal practice in most other advanced economies.
It's not all glitz and glamor in Dubai... I would like to add that Dubia is just one of the "business playgrounds" around the world. I wouldn't say it's fake, it's man-made with intention, and with a lot of money they are growing quite rapidly. I guess we can say it's all about the money, as always. Money is the main fuel, it keeps people there, it attracts many others and it's how the world works.
Well, I wouldn't say that Dubai is better for business than Europe... maybe it's foolish to make such comparisons without concrete examples of how one place is better for business than another. Each place has its advantages and disadvantages, and what suits someone more or less depends on the type of business.