Take a look at the user profiles for several of the 1--2 sentence reviews. Most of them wrote reviews for Jet Chevrolet, some Seattle coffee, Windows Doors & More, and another.
WDM owner: In the interest of your company's integrity, you should systematically delete these reviews. I'm not sure if you're the victim of some creative marketing company that promised to bump your ratings and customer base or if this is your own doing, but it makes WDM look awful.
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