one of the three best buying opportunities in a decade?

Thus far the major indexes are close to or about 20% off of this year's high. Seems like a typical 20% correction every year or so. But it's the short two week violent move and intensity of the correction that makes it remarkable. From a long term perspective this could be a good long term opportunity to add positions to one's portfolio. The other two good long term buys I'm referring to are 1) the DotCom Crash bottom from October 2002 to March 2003, and the Credit Crisis bottom from October 2008 to March 2009 bottom. In the near 3 to 6 months period it could be some pain but in the 1 to 2+ years horizon the reward should overcome the current risk.