For everyone who keeps pointing to U6 numbers as a way to say the economy is sucking: Wrong. U6 unemployment is also down. In 2009 when Obama took office it was between 15-17%. Now it is just over 11%.
For everyone who says U6 is worthless and is not a good measure: Wrong. It is a very useful measure, because it includes people who were looking for a job but gave up because they couldn't find one and thus are technically no longer in the labor force. If all the currently unemployed gave up looking for work, the standard unemployment rate would be 0%. It doesn't require much explanation to see why looking at U6 might be useful. It also includes people who are looking for full time work but can only find part times jobs.
U6 helps shed some light on the standard unemployment numbers, and is important to look at. With that said, U6 is down just like standard unemployment, so it cannot be used as a way to claim the economy is getting worse. It shows the opposite.