Tossing in my three cents worth - I feel the circle should always move at walking pace - but that it should move more often and be a little stronger. This would mean that people rarely die to the circle, because they can always outpace it, but that if it does catch you it will punish you. In fact, it could just constantly move towards the white line, with the white line relocating every time the blue line hits it.
I play Dark Souls with a 360 controller, and when I play this afterwards, as above, the UI displays the 360 icons. Not a problem except there is no button to spectate at the end of a squad match, and no kill count. Love that the controller no longer rumbles, but need to spectate.