While most reviewers originally wrote the Steam Controller off as too weird, Valve sold over 500,000 in the first six months. It became one of the most configurable gaming devices -- you could play Street Fighter V strictly with motion controls or Serious Rocket League with the grips programmed for acceleration/brake and drift/boost.
What the Steam Controller truly was was different, and that, predictably, attracted haters -- people who didn't want to spend time mastering a touch surface that blurred the lines between mouse, trackball, thumbstick and button.
Regardless of how you feel about the Steam Controller, it will soon be a misfit piece of gaming history. If you act fast, you can get one before they're gone for good. The $5 deal ends December 3rd.