The market as a whole is up 7%, so really they're down 10%. They lost money in a bull market
Performance can really only be compared with risk free returns (ie. TIPS). Anything else and you have to look at a bunch of other factors like volatility, VAR etc.
Index funds may be the historically best performing equity investments (when including expense ratio) but no equity investment is risk-free.
A crash would make for interesting times, that much is certain.