Based on the aggregated intelligence of 165,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, electric vehicle maker Tesla Motors (Nasdaq: TSLA) has received the dreaded one-star ranking.

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

Tesla facts

Headquarters (Incorporated)

Palo Alto, Calif. (2003)

Market Cap

$1.5 billion

Industry

Auto manufacturing

Trailing-12-Month Revenue

$111.9 million

Management

CEO Elon Musk (since 2008)

CFO Deepak Ahuja (since 2008)

Trailing-12-Month Operating and Net Income Margin

 (54.8%) and (61.9%)

Cash/Debt

$61.6 million / $30.9 million

Price-to-Sales (TSLA and S&P 500)

13.4 and 0.4

Sources: Capital IQ (a division of Standard & Poor's) and Motley Fool CAPS.

On CAPS, 68% of the 398 members who have rated Tesla believe the stock will underperform the S&P 500 going forward. These bears include All-Stars ellipsoid and JtHExperimental, both of whom are ranked in the top 15% of our community.

Just last week, ellipsoid tapped Tesla as questionable investment:

Let me start by saying that I'm a fan of Tesla. I really would like to see them succeed in the long run. However, they have not made a profit, they have only sold about 1000 of their roadsters, they will be stopping production of their roadsters for about a year (about a year from now), the design of the Model S isn't complete, their factory isn't ready for production, etc.

Like ellipsoid, many in our community really do think Tesla is a good green idea. After all, Daimler's 10% equity stake in the company last year and, more recently, Toyota's (NYSE: TM) $50 million infusion alongside Tesla's IPO, lend some credibility to Tesla's technology. But Tesla bears just can't wrap their heads around how a money-losing operation with no manufacturing experience and no scale advantage over giants like Ford (NYSE: F) and Nissan can compete in an already brutal business. Not to mention Tesla's seemingly nose-bleed valuation, as CAPS member JtHExperimental nicely illustrates:

Even if gross margins can stay in the 20% range, that means that gross revenues need to be in the range of about $600 million to cover overhead at the very least. Keep in mind, this is an extremely liberal estimate; in reality, their overhead would probably increase significantly more if they sold enough cars to create that much revenue. ...

In order to sell that mass number of cars, Tesla would most likely have to sacrifice its 20% gross margins in order to compete with Ford, Nissan, Chevy, Toyota, and the other automakers. So realistically speaking, in a good environment, we might be looking at somewhere close to $5-$10 billion in revenues to produce the necessary profit.

In other words, my belief is that [Tesla] needs to increase its revenues by about 42 times its current level to justify its valuation. That seems like a difficult goal to achieve. ... Green trendsters are only going to carry you so far --- and Nissan and Ford are way ahead of Tesla when it comes to selling a mass-manufactured electric car.

What do you think about Tesla, or any other stock for that matter? If you want to retire rich, you need to protect your portfolio from any undue risk. Staying away from dangerous stocks is crucial to securing your financial future, and on Motley Fool CAPS, thousands of investors are working every day to flag them. CAPS is 100% free, so get started!