Don't understand what you mean by the 5%.
Unit trusts offer professional management of a diversified portfolio in assets that are hard or even impossible to access for investors otherwise. However:
(1) Active managers as a group will underperform the market and most people cannot pick the winners ahead of time. Coupled with most investors' tendency to chase performance, it is likely that most people will underperform the market.
(2) The platform fees, unit trust sales charges, redemption charges, management fees etc. are excessive, resulting in even more underperformance. This is all the more obvious in the current era of low absolute returns.
(3) The rise of ETFs, a much more cost-effective investment vehicle, means there is no real reason to invest in unit trusts, unless you have a thing for a certain manager.
lzydata is right. Given that passive index ETFs are cheaper and outperform most fund managers, it is a no-brainer to buy passive index ETFs for retail investors. It does not mean fund managers in general are no good. Just that after deducting for their fees, they have to be really good to beat low-cost index funds.
However, I do believe that the best investors are the hedge fund managers. Unfortunately, they are pretty useless to retail investors like us because hedge fund managers do not want our business. We are too small to be worth their attention. Hedge funds are available only to high net-worth individuals.
I have written at length about relying on fund managers. Read if you are still interested.
Help your own money: Relying on fund managers