Just look at Dubai's property history--major swings. It is not for the faint hearted and carries a large amount of risk compared to other countries.
Dubai/UAE is an emerging economy and, as such, caries risk. Look at the stock market this week. 20% drop. Regardless of whether or not it is sparked by one company the INDEX itself, which represents the economy, took a major hit and nicely represents the risk of ANY investment here.
Add to the fact that for most people Dubai is temporary - ie. not spending the rest of your life here - and the level of risk amplifies due to the fact that the house value will swing and those swings may not coincide with your planned leaving date.
Back 'home' if the value declines it is usually not as risky since is your residence and a sale of it to move house means the other properties have declined as well. Or you can continue to live in the home.
Anyway, there are lots of threads on here with various opinions about property in Dubai.
I'll say this though--Dubai is not even close to being comparable to any other major city in the West. Period. With that comes immense risk.