Based on the aggregated intelligence of 180,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, online real estate marketplace operator Zillow (Nasdaq: Z) has received the dreaded one-star ranking.

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

Zillow facts

Headquarters (Founded) Seattle (2004)
Market Cap $1.3 billion
Industry Internet software and services
Trailing-12-Month Revenue $89.6 million
Management Co-Founder/Chairman Richard Barton
CEO Spencer Rascoff
Trailing-12-Month Return on Equity 5.1%
Cash/Debt $69.6 million / $0
Competitors HomeGain.com
Market Leader
Zaio

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

On CAPS, 60% of the 130 All-Star members who have rated Zillow believe the stock will underperform the S&P 500 going forward.

Just yesterday, one of those bears, Chemdawg, touched on Zillow's seemingly unsustainable valuation:

[I'm] curious to see how the markets react in the next few weeks to QE3 ... but the P/E on [Zillow] is off the charts ... and real discretionary income will decrease as inflation starts to rip the throats out of middle class [A]merican budgets (for those few that actually do budget). [T]his will have a deleterious effect on consumer spending. [N]ot sure how much this will affect housing, but I don't see it helping any.

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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.