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..."Sales of previously owned homes ticked up in March from a month earlier but were below year-earlier levels as tight inventory levels, rising mortgage rates and high prices made for a sluggish start to the spring selling season."That's how The Wall Street Journal (subscription required) described the state of the housing market on Monday -- beginning to thaw in the spring weather after a long winter, but still far from blazing hot.