Here's another look at what a difference a few months makes when evaluating whether you're better off than you were "four years ago," this time looking at the S&P 500. As you can see, between four years ago and Barack Obama's inauguration stock prices collapsed.
Consequently, if you ask how your investments are doing over the past four years the answer is "pretty bad." In inflation-adjusted terms, your stock portfolio has probably lost value. But if you ask how your investments have done since Obama took office the answer is "great."