The Healthcare industry is a very unusual sector in that it is better to have less of it. Obamacare goes in EXACTLY the WRONG direction

Less of it in the sense that it would be better if people were healthier and the treatments were more effective so that people needed less of it. 

American Healthcare companies make more money if there is more of it (higher levels of spending) because people are LESS healthy and need more of it (they also make more money if the treatments are less effective, e.g. so that people need to stay on the drugs for longer or there are side effects from the drugs or they suffer complications from an operation.) 

The fundamental drivers of the American Healthcare industry are in direct opposition to the interests of the public. 
Obamacare just makes it worse, by making the American Healthcare market even less competitive. 
It will dramatically increase the costs of Healthcare - Healthcare premiums are set to rise by 30 to 100% (it varies by state) when Obamacare is due to fully come in from October 2013. 
It will also dramatically increase the profits of the large Healthcare companies. The large Healthcare companies are licking their lips at the prospect - the Healthcare sector is one of the biggest risers in the recent stock market rally.  

In single payer schemes the government has control over the level of total spending and there are therefore some incentives to get better value. 
Even here though every government single payer scheme is fundamentally mismanaged and could be made to be a hell of a lot better - even in France, Canada and Australia. 

Tell me an area of government activity that isn't drastically and fundamentally mismanaged in any country. 
I don't know of any (some are worse than others). 

For the full effects of the full implementation of Obamacare see this. 
It is going to cost millions of American jobs. 
http://ian56.blogspot.co.uk/2013/03/the-multiple-factors-that-will-send-us.html