Some people have mentioned the traffic. If you don't think it will become a huge and negative factor in your life should you come to Dubai, think again.
I've just returned from the airport. It took me one hour from the Bustan Rotana to Departures, (that's about one kilometre for those not familiar with Dubai), mostly because of cretins unwilling to wait and roaring up from the far left lanes and pushing their way in.
Some very unhappy campers among the drivers around me - and I suspect a few outbound passengers who might not have made their flights.