Just my opinion....
If a person doesn't have a low cost index fund that mirrors the S&P 500, they are better off only investing in the lowest expense ratio fund that their plan offers up to their full match amount. DONT leave that match on the table. So many people do that and it is SO STUPID. PERIOD. END STOP.
Then, put the rest of their money into an IRA mirroring one of the low expense ratio 500 index funds instead of dumping more money into some crappy fund with an outrageous expense ratio....
My fund is the Spartan 500 Index. Its ratio is 0.0085% ($0.085 per $1,000). I'm not paying much of their light bill with fees and all (well, almost) of my money is compounding.......
If the 500 fails, America is failing.....Its a safe bet IMO.