Check out these links for opinion polls from a number of countries including the USA on their perception of capitalism and the free market:

http://www.worldpublicopinion.org/pipa/articles/btglobalizationtradera/684.php

There is also this 2012 study by Pew Global Attitudes that repeats the result:

http://www.pewglobal.org/database/?indicator=18

You can click on each country to see how opinion has changed in the last decade – big drops in Mexico, Italy, Spain
They added Greece just last year – no surprise.

This poll done for the BBC by Globescan has more bad news for capitalism:

http://www.globescan.com/images/images/pressreleases/bbc2012_economics/BBC12_Economics.pdf  (complete)

http://www.globescan.com/84-press-releases-2012/179-economic-system-seen-as-unfair-global-poll.html (summary)