It was getting quite bad a few years ago. but nowadays it's got a lot safer.
I think the crime rate was comparible to New York, but not anymore, and there's a lot of visible policing now too.
Of course, still keep your wits about you no matter where you go in the world, and it doesn't harm to try and fit in & try not to wear too much visible expensive jewelerry, etc... keep your phone in your pocket, your wallet out of the back pocket (rather in the front). In other words, if you make yourself look like a mugging waiting to happen, it might just happen.
But then again, with the visible policing and security companies around now... much safer.