I would just quote the following from the article you linked to:
This is no Paris. Whoever said Buenos Aires is the Paris of the south was on crack. It is a dangerous city, and the economy is getting worse. Use extreme caution and do not take anything valuable with you. For all the women out there, please be careful! Cops and Taxi's are not always safe, and people will follow you. Walk in pairs or groups and use your judgement when choosing your cab driver (and make sure you know where you're going!)
All of the points in the article do not seem like exaggerations to me. However, I have been here for the last 4 months, no one has stolen anything off of me (they robbed apartments in the building I am in and stole one of the door handles). The reason might be that I don't have anything worth stealing when I am on the streets. I have an iPhone 4 that I have never used in public. The phone I use is an old, rusted motorola that no one wants to steal. I even hate the damn thing so much that I sometimes wish they'd steal it!
I also don't use an iPod or whatever and if I ever do, I don't use the white earphones that tell everyone what it is that I am using as my music device.
However, on the other hand, whenever I travel on the subte (I do not use buses here, drivers are freakin' crazy), I see half the people there on their blackberries, samsungs, nokias and what have you. I see a lot of people with white earphones too. And most of the times they don't seem to care if their electronics are going to get stolen or not.
I am hoping you're going to be staying with a friend or a 4-5 star hotel in a safe part of town where you can leave your more expensive belongings in your room when you're out and about. However, even the 5-star hotels are not safe and robberies do often happen.
You really need to be careful where you hang out and what time you are out as well.
Anyway, like I said, I personally have not been robbed. And you can survive here but the key is not to let on that you're a tourist. If you don't shower for like 3 days, you might fit in as a local...
No I am just kidding. Just be careful, don't act like a tourist with a big-ass camera and all that, have fun and be aware of your surroundings, you should be fine.