If you were to ask me if I would play games with the Steam Controller…I would say yes. If you were to ask me to choose between Steam Controller and a 360 controller, I would choose 360. Don’t take that as slight to the controller though because it’s more about the comfort of familiarity over functionality. I would choose a 360 controller because I have several thousand hours experience using it, however if tomorrow all game controllers were wiped off the earth and the only option was the Steam Controller, I don’t think this would be a bad thing. In fact, I don’t think gaming would miss a beat. I’m excited to see what final hardware feels like because I think with the upcoming iterations of the controller we’ll see something that is different, but still feels good.
TL;DR; Great Start, needs some improvements, but I could play any game I wanted with it just fine.