It's the big unknown: How will the Steam Controller function once it's being used for a wide swath of games? Will it be convincing enough to coax PC gamers into grasping gamepads?
I don't know yet, and the gamepad's certainly still a work in iterative progress. My excitement for the Steam Controller has certainly cooled since its reveal last year, however. So far, it's neither as precise as a mouse nor as easy as an Xbox 360 controller, a proverbial jack-of-all trades.
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