It might not be close to the "Great Depression" but it certainly isn't like your average cyclical recession either. The length of this downturn, slowdown (since 2007) is one part and the REALLY slow recovery is the other.
http://www.conference-board.org/data/globaloutlook.cfm
If you leave off China and other developing countries, the total growth in GDP for the U.S., European Union (15) and other "advanced countries" is a measly 1.7% over a 6 year period. Europe and Japan last year and this year either had negative or negligible growth.
For a better summary of global financial problems, including the looming massive Chinese property bubble and over-leveraged European debt:
http://www.forbes.com/sites/greatspeculations/2012/05/30/watching-a-global-depression-develop-in-slow-motion/
The problems of 2007-2009 in the U.S. were just the tip of the iceberg, there are a lot of other global economic problems that linger.