Based on the aggregated intelligence of 180,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, ProShares Short Dow30 (NYSE: DOG) has received the dreaded one-star ranking.

With that in mind, let's take a closer look at ProShares Short Dow30 and see what CAPS investors are saying about the ETF right now.

ProShares Short Dow30 facts

Inception June 2006
Total Net Assets $270.8 million
Investment Approach Seeks daily investment results that correspond to the inverse (opposite) of the daily performance of the Dow Jones Industrial Average Index.
Expense Ratio 0.95%
1-Year, 3-Year, and 5-Year Returns (20.4%); (15.8%); (8.1%)
Alternatives ProShares UltraShort S&P 500
ProShares Short S&P 500
ProShares UltraShort Dow30

Sources: S&P Capital IQ and Motley Fool CAPS.

On CAPS, 79% of the 215 All-Star members who have rated ProShares Short Dow30 believe the ETF will underperform the S&P 500 going forward.

Just last month, one of those Fools, All-Star TerryHogan, offered a straightforward explanation for his underperform call:

Simple bet on the Dow. Plus, this is a bet on volatility, as these ETFs are set to deliver a return that is the inverse of the DOW for a single day. [O]ver time, they won't match it if there's any volatility at all.

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Want to see how well (or not so well) the stocks in this series are performing? Follow the TrackPoisedTo CAPS account.