Every day, Wall Street analysts upgrade some stocks, downgrade others, and "initiate coverage" on a few more. But do these analysts even know what they're talking about? Today, we're taking one high-profile Wall Street pick and putting it under the microscope...It's been four days since Deere & Co. (NYSE: DE) wowed Wall Street with its second-quarter 2017 earnings report -- and the waves of applause just keep rolling in.