Based on the aggregated intelligence of 180,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, ProShares Short MidCap 400 (NYSE: MYY) has received the dreaded one-star ranking.

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

MYY facts

Inception June 2006
Total Net Assets $25.4 million
Investment Approach Seeks daily investment results that correspond to the inverse (-1x) of the daily performance of the S&P MidCap 400 Index. The index is a widely used measure of mid-size company U.S. stock market performance.
Expense Ratio 0.95%
1-Year / 3-Year / 5-Year Returns (25.1%) / (17.9%) / (12.0%)
Alternatives ProShares UltraShort S&P500
ProShares Short S&P500
Direxion Daily Small Cap Bear 3x Shares

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

On CAPS, 44% of the 385 members who have rated the ProShares ETF believe it will underperform the S&P 500 going forward.

Just last week, one of those Fools, All-Star TerryHogan, succinctly summed up the bear case for our community:

Contractual waiver on the expense ratio is done at the end of September, that's when the underperformance of this dud will really start to sparkle. Expenses will go from 0.95% to 1.25% (or more maybe?). Plus, the mid-cap 400 is not something I want to bet against. Also this thing tries to match the inverse return daily, so with volatility over time this thing will not do well.

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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.