While Fools should generally take the opinion of Wall Street with a grain of salt, it's not a bad idea to take a closer look at particularly stock-shaking upgrades and downgrades -- just in case their reasoning behind the call makes sense.

What: Shares of eBay, Inc. (NASDAQ:EBAY) had a sluggish morning after Evercore Partners downgraded the online auction giant from Overweight to Equal Weight.

So what: Along with the downgrade, analyst Ken Sena reiterated his price target of $58, representing about 12% worth of upside to yesterday's close. Although Sena believes that eBay's valuation remains reasonable, he sees near-term pressure on the stock due to sustained take-rate headwinds.

Now what: According to Evercore, eBay's risk/reward trade-off is pretty balanced at this point. "Our rating revision weighs eBay's large addressable markets and undemanding valuation against the potential for sustained take-rate pressure within Payments and a higher level of investment across segments," noted Evercore. "Moreover, while we do not see valuation risk at these levels, we do suspect the potential for further negative estimate revisions, including its 2015 guidance." With the eBay off about 10% from its 52-week highs and trading at a forward P/E of 15, however, those short-term concerns might be providing patient Fools with a high-quality long-term opportunity.

Fool contributor Brian Pacampara has no position in any stocks mentioned. The Motley Fool recommends eBay. The Motley Fool owns shares of eBay. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.